18918575 has 12 divisors (see below), whose sum is σ = 25264008. Its totient is φ = 13970400.

The previous prime is 18918551. The next prime is 18918577. The reversal of 18918575 is 57581981.

It is a happy number.

It is not a de Polignac number, because 18918575 - 2¹⁰ = 18917551 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18918577) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28781 + ... + 29430.

It is an arithmetic number, because the mean of its divisors is an integer number (2105334).

Almost surely, 2^18918575 is an apocalyptic number.

18918575 is a deficient number, since it is larger than the sum of its proper divisors (6345433).

18918575 is a wasteful number, since it uses less digits than its factorization.

18918575 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58234 (or 58229 counting only the distinct ones).

The product of its digits is 100800, while the sum is 44.

The square root of 18918575 is about 4349.5488271774. The cubic root of 18918575 is about 266.4584355318.

The spelling of 18918575 in words is "eighteen million, nine hundred eighteen thousand, five hundred seventy-five".