18169825 has 12 divisors (see below), whose sum is σ = 22598380. Its totient is φ = 14492160.

The previous prime is 18169819. The next prime is 18169829. The reversal of 18169825 is 52896181.

It can be written as a sum of positive squares in 6 ways, for example, as 200704 + 17969121 = 448^2 + 4239^2 .

It is not a de Polignac number, because 18169825 - 2²¹ = 16072673 is a prime.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (18169829) 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, 9337 + ... + 11113.

Almost surely, 2^18169825 is an apocalyptic number.

It is an amenable number.

18169825 is a deficient number, since it is larger than the sum of its proper divisors (4428555).

18169825 is a wasteful number, since it uses less digits than its factorization.

18169825 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2196 (or 2191 counting only the distinct ones).

The product of its digits is 34560, while the sum is 40.

The square root of 18169825 is about 4262.6077698986. The cubic root of 18169825 is about 262.8957597953.

The spelling of 18169825 in words is "eighteen million, one hundred sixty-nine thousand, eight hundred twenty-five".