18843240 has 128 divisors (see below), whose sum is σ = 62415360. Its totient is φ = 4521984.

The previous prime is 18843239. The next prime is 18843283. The reversal of 18843240 is 4234881.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 18843198 and 18843207.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 73192 + ... + 73448.

It is an arithmetic number, because the mean of its divisors is an integer number (487620).

Almost surely, 2^18843240 is an apocalyptic number.

18843240 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 18843240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31207680).

18843240 is an abundant number, since it is smaller than the sum of its proper divisors (43572120).

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

18843240 is a wasteful number, since it uses less digits than its factorization.

18843240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 331 (or 327 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 30.

The square root of 18843240 is about 4340.8800950959. The cubic root of 18843240 is about 266.1042800665.

The spelling of 18843240 in words is "eighteen million, eight hundred forty-three thousand, two hundred forty".