18856938 has 16 divisors (see below), whose sum is σ = 37780416. Its totient is φ = 6274560.

The previous prime is 18856921. The next prime is 18856951. The reversal of 18856938 is 83965881.

It is a super-2 number, since 2×18856938² = 711168221471688, 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, 1395 + ... + 6297.

It is an arithmetic number, because the mean of its divisors is an integer number (2361276).

Almost surely, 2^18856938 is an apocalyptic number.

18856938 is an abundant number, since it is smaller than the sum of its proper divisors (18923478).

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

18856938 is a wasteful number, since it uses less digits than its factorization.

18856938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5549.

The product of its digits is 414720, while the sum is 48.

The square root of 18856938 is about 4342.4575991021. The cubic root of 18856938 is about 266.1687455109.

The spelling of 18856938 in words is "eighteen million, eight hundred fifty-six thousand, nine hundred thirty-eight".