18639056 has 10 divisors (see below), whose sum is σ = 36113202. Its totient is φ = 9319520.

The previous prime is 18639013. The next prime is 18639059. The reversal of 18639056 is 65093681.

It can be written as a sum of positive squares in only one way, i.e., 16679056 + 1960000 = 4084^2 + 1400^2 .

It is a super-2 number, since 2×18639056² = 694828817142272, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18639059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 582455 + ... + 582486.

Almost surely, 2^18639056 is an apocalyptic number.

18639056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18639056 is a deficient number, since it is larger than the sum of its proper divisors (17474146).

18639056 is a wasteful number, since it uses less digits than its factorization.

18639056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1164949 (or 1164943 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 38.

The square root of 18639056 is about 4317.2973027115. The cubic root of 18639056 is about 265.1396250084.

The spelling of 18639056 in words is "eighteen million, six hundred thirty-nine thousand, fifty-six".