18998525 has 36 divisors (see below), whose sum is σ = 29537172. Its totient is φ = 12015360.

The previous prime is 18998519. The next prime is 18998533. The reversal of 18998525 is 52589981.

It can be written as a sum of positive squares in 6 ways, for example, as 1999396 + 16999129 = 1414^2 + 4123^2 .

It is not a de Polignac number, because 18998525 - 2¹⁴ = 18982141 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18998525.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 15329 + ... + 16521.

It is an arithmetic number, because the mean of its divisors is an integer number (820477).

Almost surely, 2^18998525 is an apocalyptic number.

It is an amenable number.

18998525 is a deficient number, since it is larger than the sum of its proper divisors (10538647).

18998525 is a wasteful number, since it uses less digits than its factorization.

18998525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1230 (or 1218 counting only the distinct ones).

The product of its digits is 259200, while the sum is 47.

The square root of 18998525 is about 4358.7297461531. The cubic root of 18998525 is about 266.8332596191.

The spelling of 18998525 in words is "eighteen million, nine hundred ninety-eight thousand, five hundred twenty-five".