18200972 has 6 divisors (see below), whose sum is σ = 31851708. Its totient is φ = 9100484.

The previous prime is 18200971. The next prime is 18200977. The reversal of 18200972 is 27900281.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18200971) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2275118 + ... + 2275125.

It is an arithmetic number, because the mean of its divisors is an integer number (5308618).

Almost surely, 2^18200972 is an apocalyptic number.

It is an amenable number.

18200972 is a deficient number, since it is larger than the sum of its proper divisors (13650736).

18200972 is a wasteful number, since it uses less digits than its factorization.

18200972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4550247 (or 4550245 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 18200972 is about 4266.2597201764. The cubic root of 18200972 is about 263.0458940569.

The spelling of 18200972 in words is "eighteen million, two hundred thousand, nine hundred seventy-two".