18380808 has 48 divisors (see below), whose sum is σ = 52713180. Its totient is φ = 5766144.

The previous prime is 18380797. The next prime is 18380819. The reversal of 18380808 is 80808381.

It is an interprime number because it is at equal distance from previous prime (18380797) and next prime (18380819).

It can be written as a sum of positive squares in 2 ways, for example, as 18301284 + 79524 = 4278^2 + 282^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6285 + ... + 8732.

Almost surely, 2^18380808 is an apocalyptic number.

18380808 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18380808 is an abundant number, since it is smaller than the sum of its proper divisors (34332372).

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

18380808 is a wasteful number, since it uses less digits than its factorization.

18380808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15046 (or 15039 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 36.

The square root of 18380808 is about 4287.2844552234. The cubic root of 18380808 is about 263.9094041759.

The spelling of 18380808 in words is "eighteen million, three hundred eighty thousand, eight hundred eight".