1831920 has 80 divisors (see below), whose sum is σ = 6026400. Its totient is φ = 458752.

The previous prime is 1831913. The next prime is 1831933. The reversal of 1831920 is 291381.

It is a tau number, because it is divible by the number of its divisors (80).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3856 + ... + 4304.

It is an arithmetic number, because the mean of its divisors is an integer number (75330).

2^1831920 is an apocalyptic number.

1831920 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 1831920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3013200).

1831920 is an abundant number, since it is smaller than the sum of its proper divisors (4194480).

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

1831920 is a wasteful number, since it uses less digits than its factorization.

1831920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 482 (or 476 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 1831920 is about 1353.4843922262. The cubic root of 1831920 is about 122.3588823400.

The spelling of 1831920 in words is "one million, eight hundred thirty-one thousand, nine hundred twenty".