18972801 has 6 divisors (see below), whose sum is σ = 27405170. Its totient is φ = 12648528.

The previous prime is 18972797. The next prime is 18972817. The reversal of 18972801 is 10827981.

It can be written as a sum of positive squares in only one way, i.e., 9828225 + 9144576 = 3135^2 + 3024^2 .

It is not a de Polignac number, because 18972801 - 2² = 18972797 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18972841) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1054036 + ... + 1054053.

Almost surely, 2^18972801 is an apocalyptic number.

It is an amenable number.

18972801 is a deficient number, since it is larger than the sum of its proper divisors (8432369).

18972801 is a wasteful number, since it uses less digits than its factorization.

18972801 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2108095 (or 2108092 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 36.

The square root of 18972801 is about 4355.7778868992. Note that the first 3 decimals coincide. The cubic root of 18972801 is about 266.7127744926.

The spelling of 18972801 in words is "eighteen million, nine hundred seventy-two thousand, eight hundred one".