18972465 has 16 divisors (see below), whose sum is σ = 31335936. Its totient is φ = 9792000.

The previous prime is 18972451. The next prime is 18972517. The reversal of 18972465 is 56427981.

It is not a de Polignac number, because 18972465 - 2⁴ = 18972449 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 19936 + ... + 20865.

It is an arithmetic number, because the mean of its divisors is an integer number (1958496).

Almost surely, 2^18972465 is an apocalyptic number.

18972465 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18972465 is a deficient number, since it is larger than the sum of its proper divisors (12363471).

18972465 is a wasteful number, since it uses less digits than its factorization.

18972465 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40840.

The product of its digits is 120960, while the sum is 42.

The square root of 18972465 is about 4355.7393172687. The cubic root of 18972465 is about 266.7112000278.

The spelling of 18972465 in words is "eighteen million, nine hundred seventy-two thousand, four hundred sixty-five".