18631672 has 16 divisors (see below), whose sum is σ = 35281800. Its totient is φ = 9223200.

The previous prime is 18631667. The next prime is 18631681. The reversal of 18631672 is 27613681.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10722 + ... + 12337.

Almost surely, 2^18631672 is an apocalyptic number.

It is an amenable number.

18631672 is a deficient number, since it is larger than the sum of its proper divisors (16650128).

18631672 is a wasteful number, since it uses less digits than its factorization.

18631672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23166 (or 23162 counting only the distinct ones).

The product of its digits is 12096, while the sum is 34.

The square root of 18631672 is about 4316.4420533583. The cubic root of 18631672 is about 265.1046080422.

Subtracting 18631672 from its reverse (27613681), we obtain a square (8982009 = 2997²).

The spelling of 18631672 in words is "eighteen million, six hundred thirty-one thousand, six hundred seventy-two".