18201572 has 12 divisors (see below), whose sum is σ = 31887996. Its totient is φ = 9090720.

The previous prime is 18201569. The next prime is 18201587. The reversal of 18201572 is 27510281.

It can be written as a sum of positive squares in 2 ways, for example, as 17522596 + 678976 = 4186^2 + 824^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2798 + ... + 6650.

It is an arithmetic number, because the mean of its divisors is an integer number (2657333).

Almost surely, 2^18201572 is an apocalyptic number.

It is an amenable number.

18201572 is a deficient number, since it is larger than the sum of its proper divisors (13686424).

18201572 is a wasteful number, since it uses less digits than its factorization.

18201572 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5038 (or 5036 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 18201572 is about 4266.3300388038. The cubic root of 18201572 is about 263.0487844850.

The spelling of 18201572 in words is "eighteen million, two hundred one thousand, five hundred seventy-two".