18257690 has 48 divisors (see below), whose sum is σ = 36771840. Its totient is φ = 6520800.

The previous prime is 18257641. The next prime is 18257717. The reversal of 18257690 is 9675281.

It is a super-4 number, since 4×18257690⁴ (a number of 30 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a Smith number, since the sum of its digits (38) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 95495 + ... + 95685.

It is an arithmetic number, because the mean of its divisors is an integer number (766080).

Almost surely, 2^18257690 is an apocalyptic number.

18257690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18257690 is an abundant number, since it is smaller than the sum of its proper divisors (18514150).

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

18257690 is a wasteful number, since it uses less digits than its factorization.

18257690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 299 (or 288 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 38.

The square root of 18257690 is about 4272.9018242876. The cubic root of 18257690 is about 263.3188458978.

The spelling of 18257690 in words is "eighteen million, two hundred fifty-seven thousand, six hundred ninety".