183840 has 48 divisors (see below), whose sum is σ = 580608. Its totient is φ = 48896.

The previous prime is 183829. The next prime is 183871. The reversal of 183840 is 48381.

Added to its reverse (48381) it gives a triangular number (232221 = T₆₈₁).

It is a tau number, because it is divible by the number of its divisors (48).

It is a hoax number, since the sum of its digits (24) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 183840.

It is an unprimeable number.

183840 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 289 + ... + 671.

It is an arithmetic number, because the mean of its divisors is an integer number (12096).

2¹⁸³⁸⁴⁰ is an apocalyptic number.

183840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 183840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (290304).

183840 is an abundant number, since it is smaller than the sum of its proper divisors (396768).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

183840 is a wasteful number, since it uses less digits than its factorization.

183840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401 (or 393 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 183840 is about 428.7656702676. The cubic root of 183840 is about 56.8608486307.

Adding to 183840 its reverse (48381), we get a triangular number (232221 = T₆₈₁).

The spelling of 183840 in words is "one hundred eighty-three thousand, eight hundred forty".