18723572 has 12 divisors (see below), whose sum is σ = 37447200. Its totient is φ = 8024376.

The previous prime is 18723571. The next prime is 18723577. The reversal of 18723572 is 27532781.

18723572 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18723571) 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, 334322 + ... + 334377.

It is an arithmetic number, because the mean of its divisors is an integer number (3120600).

Almost surely, 2^18723572 is an apocalyptic number.

It is an amenable number.

18723572 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.

18723572 is a wasteful number, since it uses less digits than its factorization.

18723572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 668710 (or 668708 counting only the distinct ones).

The product of its digits is 23520, while the sum is 35.

The square root of 18723572 is about 4327.0743002634. The cubic root of 18723572 is about 265.5397660925.

The spelling of 18723572 in words is "eighteen million, seven hundred twenty-three thousand, five hundred seventy-two".