18972530 has 16 divisors (see below), whose sum is σ = 34421760. Its totient is φ = 7528752.

The previous prime is 18972529. The next prime is 18972563. The reversal of 18972530 is 3527981.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6200 + ... + 8739.

It is an arithmetic number, because the mean of its divisors is an integer number (2151360).

Almost surely, 2^18972530 is an apocalyptic number.

18972530 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18972530 is a deficient number, since it is larger than the sum of its proper divisors (15449230).

18972530 is a wasteful number, since it uses less digits than its factorization.

18972530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15073.

The product of its (nonzero) digits is 15120, while the sum is 35.

The square root of 18972530 is about 4355.7467786822. The cubic root of 18972530 is about 266.7115046132.

The spelling of 18972530 in words is "eighteen million, nine hundred seventy-two thousand, five hundred thirty".