18325640 has 32 divisors (see below), whose sum is σ = 41425560. Its totient is φ = 7296000.

The previous prime is 18325631. The next prime is 18325649. The reversal of 18325640 is 4652381.

It is an interprime number because it is at equal distance from previous prime (18325631) and next prime (18325649).

It can be written as a sum of positive squares in 4 ways, for example, as 12859396 + 5466244 = 3586^2 + 2338^2 .

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (18325649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8690 + ... + 10590.

Almost surely, 2^18325640 is an apocalyptic number.

18325640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18325640 is an abundant number, since it is smaller than the sum of its proper divisors (23099920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18325640 is a wasteful number, since it uses less digits than its factorization.

18325640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2153 (or 2149 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 29.

The square root of 18325640 is about 4280.8457108380. The cubic root of 18325640 is about 263.6451077704.

The spelling of 18325640 in words is "eighteen million, three hundred twenty-five thousand, six hundred forty".