18504975 has 24 divisors (see below), whose sum is σ = 30748032. Its totient is φ = 9820000.

The previous prime is 18504973. The next prime is 18504977. The reversal of 18504975 is 57940581.

It is an interprime number because it is at equal distance from previous prime (18504973) and next prime (18504977).

It is not a de Polignac number, because 18504975 - 2¹ = 18504973 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18504973) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 18334 + ... + 19316.

It is an arithmetic number, because the mean of its divisors is an integer number (1281168).

Almost surely, 2^18504975 is an apocalyptic number.

18504975 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18504975 is a deficient number, since it is larger than the sum of its proper divisors (12243057).

18504975 is a wasteful number, since it uses less digits than its factorization.

18504975 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1247 (or 1242 counting only the distinct ones).

The product of its (nonzero) digits is 50400, while the sum is 39.

The square root of 18504975 is about 4301.7409266482. The cubic root of 18504975 is about 264.5023292784.

The spelling of 18504975 in words is "eighteen million, five hundred four thousand, nine hundred seventy-five".