18685776 has 20 divisors (see below), whose sum is σ = 48271712. Its totient is φ = 6228576.

The previous prime is 18685769. The next prime is 18685781. The reversal of 18685776 is 67758681.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 389287 = 18685776 / (1 + 8 + 6 + 8 + 5 + 7 + 7 + 6).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 194596 + ... + 194691.

Almost surely, 2^18685776 is an apocalyptic number.

18685776 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18685776 is an abundant number, since it is smaller than the sum of its proper divisors (29585936).

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

18685776 is a wasteful number, since it uses less digits than its factorization.

18685776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 389298 (or 389292 counting only the distinct ones).

The product of its digits is 564480, while the sum is 48.

The square root of 18685776 is about 4322.7047088600. The cubic root of 18685776 is about 265.3609700485.

The spelling of 18685776 in words is "eighteen million, six hundred eighty-five thousand, seven hundred seventy-six".