18857972 has 12 divisors (see below), whose sum is σ = 37716000. Its totient is φ = 8081976.

The previous prime is 18857963. The next prime is 18857977. The reversal of 18857972 is 27975881.

18857972 is an admirable number.

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18857977) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 336722 + ... + 336777.

It is an arithmetic number, because the mean of its divisors is an integer number (3143000).

Almost surely, 2^18857972 is an apocalyptic number.

It is an amenable number.

18857972 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18857972 is a wasteful number, since it uses less digits than its factorization.

18857972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 673510 (or 673508 counting only the distinct ones).

The product of its digits is 282240, while the sum is 47.

The square root of 18857972 is about 4342.5766544760. The cubic root of 18857972 is about 266.1736104480.

The spelling of 18857972 in words is "eighteen million, eight hundred fifty-seven thousand, nine hundred seventy-two".