18857690 has 16 divisors (see below), whose sum is σ = 35730720. Its totient is φ = 7146000.

The previous prime is 18857681. The next prime is 18857701. The reversal of 18857690 is 9675881.

It is a happy number.

It is a super-2 number, since 2×18857690² = 711224944272200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49436 + ... + 49815.

It is an arithmetic number, because the mean of its divisors is an integer number (2233170).

Almost surely, 2^18857690 is an apocalyptic number.

18857690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18857690 is a deficient number, since it is larger than the sum of its proper divisors (16873030).

18857690 is a wasteful number, since it uses less digits than its factorization.

18857690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99277.

The product of its (nonzero) digits is 120960, while the sum is 44.

The square root of 18857690 is about 4342.5441851523. The cubic root of 18857690 is about 266.1722836646.

The spelling of 18857690 in words is "eighteen million, eight hundred fifty-seven thousand, six hundred ninety".