18401572 has 24 divisors (see below), whose sum is σ = 36945216. Its totient is φ = 7855968.

The previous prime is 18401527. The next prime is 18401597. The reversal of 18401572 is 27510481.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is a self number, because there is not a number n which added to its sum of digits gives 18401572.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7083 + ... + 9325.

It is an arithmetic number, because the mean of its divisors is an integer number (1539384).

Almost surely, 2^18401572 is an apocalyptic number.

It is an amenable number.

18401572 is an abundant number, since it is smaller than the sum of its proper divisors (18543644).

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

18401572 is a wasteful number, since it uses less digits than its factorization.

18401572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2547 (or 2545 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 18401572 is about 4289.7053511867. The cubic root of 18401572 is about 264.0087424408.

The spelling of 18401572 in words is "eighteen million, four hundred one thousand, five hundred seventy-two".