18972459 has 24 divisors (see below), whose sum is σ = 31657392. Its totient is φ = 10821120.

The previous prime is 18972451. The next prime is 18972517. The reversal of 18972459 is 95427981.

It is not a de Polignac number, because 18972459 - 2³ = 18972451 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18972451) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3954 + ... + 7319.

It is an arithmetic number, because the mean of its divisors is an integer number (1319058).

Almost surely, 2^18972459 is an apocalyptic number.

18972459 is a deficient number, since it is larger than the sum of its proper divisors (12684933).

18972459 is a wasteful number, since it uses less digits than its factorization.

18972459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11307 (or 11304 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 18972459 is about 4355.7386285221. The cubic root of 18972459 is about 266.7111719122.

It can be divided in two parts, 1897 and 2459, that added together give a square (4356 = 66²).

The spelling of 18972459 in words is "eighteen million, nine hundred seventy-two thousand, four hundred fifty-nine".