18877472 has 12 divisors (see below), whose sum is σ = 37165086. Its totient is φ = 9438720.

The previous prime is 18877447. The next prime is 18877483. The reversal of 18877472 is 27477881.

It can be written as a sum of positive squares in only one way, i.e., 12138256 + 6739216 = 3484^2 + 2596^2 .

It is a super-2 number, since 2×18877472² = 712717898221568, which contains 22 as substring.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 294929 + ... + 294992.

Almost surely, 2^18877472 is an apocalyptic number.

It is an amenable number.

18877472 is a deficient number, since it is larger than the sum of its proper divisors (18287614).

18877472 is an equidigital number, since it uses as much as digits as its factorization.

18877472 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 589931 (or 589923 counting only the distinct ones).

The product of its digits is 175616, while the sum is 44.

The square root of 18877472 is about 4344.8212851624. The cubic root of 18877472 is about 266.2653240462.

The spelling of 18877472 in words is "eighteen million, eight hundred seventy-seven thousand, four hundred seventy-two".