18972936 has 24 divisors (see below), whose sum is σ = 51385230. Its totient is φ = 6324288.

The previous prime is 18972929. The next prime is 18972937. The reversal of 18972936 is 63927981.

It can be written as a sum of positive squares in only one way, i.e., 10850436 + 8122500 = 3294^2 + 2850^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a junction number, because it is equal to n+sod(n) for n = 18972891 and 18972900.

It is not an unprimeable number, because it can be changed into a prime (18972937) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 131685 + ... + 131828.

Almost surely, 2^18972936 is an apocalyptic number.

It is an amenable number.

18972936 is an abundant number, since it is smaller than the sum of its proper divisors (32412294).

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

18972936 is a wasteful number, since it uses less digits than its factorization.

18972936 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 263525 (or 263518 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 18972936 is about 4355.7933835296. The cubic root of 18972936 is about 266.7134070848.

The spelling of 18972936 in words is "eighteen million, nine hundred seventy-two thousand, nine hundred thirty-six".