18977572 has 6 divisors (see below), whose sum is σ = 33210758. Its totient is φ = 9488784.

The previous prime is 18977533. The next prime is 18977579. The reversal of 18977572 is 27577981.

It can be written as a sum of positive squares in only one way, i.e., 16208676 + 2768896 = 4026^2 + 1664^2 .

It is not an unprimeable number, because it can be changed into a prime (18977579) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2372193 + ... + 2372200.

Almost surely, 2^18977572 is an apocalyptic number.

It is an amenable number.

18977572 is a deficient number, since it is larger than the sum of its proper divisors (14233186).

18977572 is a wasteful number, since it uses less digits than its factorization.

18977572 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4744397 (or 4744395 counting only the distinct ones).

The product of its digits is 246960, while the sum is 46.

The square root of 18977572 is about 4356.3255158447. The cubic root of 18977572 is about 266.7351289497.

The spelling of 18977572 in words is "eighteen million, nine hundred seventy-seven thousand, five hundred seventy-two".