18772957 has 16 divisors (see below), whose sum is σ = 22176000. Its totient is φ = 15557760.

The previous prime is 18772937. The next prime is 18772979. The reversal of 18772957 is 75927781.

It is a cyclic number.

It is not a de Polignac number, because 18772957 - 2¹⁹ = 18248669 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18772927) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42544 + ... + 42982.

It is an arithmetic number, because the mean of its divisors is an integer number (1386000).

Almost surely, 2^18772957 is an apocalyptic number.

It is an amenable number.

18772957 is a deficient number, since it is larger than the sum of its proper divisors (3403043).

18772957 is a wasteful number, since it uses less digits than its factorization.

18772957 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 636.

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

The square root of 18772957 is about 4332.7770540382. Note that the first 3 decimals coincide. The cubic root of 18772957 is about 265.7730223097.

The spelling of 18772957 in words is "eighteen million, seven hundred seventy-two thousand, nine hundred fifty-seven".