18913975 has 12 divisors (see below), whose sum is σ = 23953824. Its totient is φ = 14808320.

The previous prime is 18913969. The next prime is 18913991. The reversal of 18913975 is 57931981.

It is not a de Polignac number, because 18913975 - 2⁷ = 18913847 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6874 + ... + 9223.

It is an arithmetic number, because the mean of its divisors is an integer number (1996152).

Almost surely, 2^18913975 is an apocalyptic number.

18913975 is a deficient number, since it is larger than the sum of its proper divisors (5039849).

18913975 is a wasteful number, since it uses less digits than its factorization.

18913975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16154 (or 16149 counting only the distinct ones).

The product of its digits is 68040, while the sum is 43.

The square root of 18913975 is about 4349.0200045527. The cubic root of 18913975 is about 266.4368375669.

The spelling of 18913975 in words is "eighteen million, nine hundred thirteen thousand, nine hundred seventy-five".