18308925 has 18 divisors (see below), whose sum is σ = 32793722. Its totient is φ = 9764640.

The previous prime is 18308923. The next prime is 18308929. The reversal of 18308925 is 52980381.

It can be written as a sum of positive squares in 3 ways, for example, as 4088484 + 14220441 = 2022^2 + 3771^2 .

It is not a de Polignac number, because 18308925 - 2¹ = 18308923 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18308925.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18308921) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 40462 + ... + 40911.

Almost surely, 2^18308925 is an apocalyptic number.

18308925 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18308925 is a deficient number, since it is larger than the sum of its proper divisors (14484797).

18308925 is a wasteful number, since it uses less digits than its factorization.

18308925 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81389 (or 81381 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 36.

The square root of 18308925 is about 4278.8929643075. The cubic root of 18308925 is about 263.5649256050.

It can be divided in two parts, 1 and 8308925, that added together give a triangular number (8308926 = T₄₀₇₆).

The spelling of 18308925 in words is "eighteen million, three hundred eight thousand, nine hundred twenty-five".