18525921 has 8 divisors (see below), whose sum is σ = 24753504. Its totient is φ = 12324480.

The previous prime is 18525919. The next prime is 18525953. The reversal of 18525921 is 12952581.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18525921 - 2¹ = 18525919 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18525961) 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 7 ways as a sum of consecutive naturals, for example, 4816 + ... + 7761.

It is an arithmetic number, because the mean of its divisors is an integer number (3094188).

Almost surely, 2^18525921 is an apocalyptic number.

It is an amenable number.

18525921 is a deficient number, since it is larger than the sum of its proper divisors (6227583).

18525921 is a wasteful number, since it uses less digits than its factorization.

18525921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13071.

The product of its digits is 7200, while the sum is 33.

The square root of 18525921 is about 4304.1748338096. The cubic root of 18525921 is about 264.6020894193.

It can be divided in two parts, 185 and 25921, that added together give a triangular number (26106 = T₂₂₈).

The spelling of 18525921 in words is "eighteen million, five hundred twenty-five thousand, nine hundred twenty-one".