18013975 has 24 divisors (see below), whose sum is σ = 25871360. Its totient is φ = 12186720.

The previous prime is 18013921. The next prime is 18013981. The reversal of 18013975 is 57931081.

It is a happy number.

It is not a de Polignac number, because 18013975 - 2¹³ = 18005783 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18013975.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13174 + ... + 14476.

Almost surely, 2^18013975 is an apocalyptic number.

18013975 is a deficient number, since it is larger than the sum of its proper divisors (7857385).

18013975 is a wasteful number, since it uses less digits than its factorization.

18013975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1399 (or 1394 counting only the distinct ones).

The product of its (nonzero) digits is 7560, while the sum is 34.

The square root of 18013975 is about 4244.2873371156. The cubic root of 18013975 is about 262.1419456925.

It can be divided in two parts, 1801 and 3975, that added together give a square (5776 = 76²).

The spelling of 18013975 in words is "eighteen million, thirteen thousand, nine hundred seventy-five".