18557240 has 64 divisors (see below), whose sum is σ = 45480960. Its totient is φ = 6773760.

The previous prime is 18557233. The next prime is 18557263. The reversal of 18557240 is 4275581.

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 18557197 and 18557206.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65900 + ... + 66180.

It is an arithmetic number, because the mean of its divisors is an integer number (710640).

Almost surely, 2^18557240 is an apocalyptic number.

18557240 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 18557240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22740480).

18557240 is an abundant number, since it is smaller than the sum of its proper divisors (26923720).

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

18557240 is a wasteful number, since it uses less digits than its factorization.

18557240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 432 (or 428 counting only the distinct ones).

The product of its (nonzero) digits is 11200, while the sum is 32.

The square root of 18557240 is about 4307.8115093397. The cubic root of 18557240 is about 264.7511131811.

The spelling of 18557240 in words is "eighteen million, five hundred fifty-seven thousand, two hundred forty".