18057808 has 40 divisors (see below), whose sum is σ = 37343592. Its totient is φ = 8429568.

The previous prime is 18057799. The next prime is 18057817. The reversal of 18057808 is 80875081.

It is an interprime number because it is at equal distance from previous prime (18057799) and next prime (18057817).

It can be written as a sum of positive squares in 4 ways, for example, as 8248384 + 9809424 = 2872^2 + 3132^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 53416 + ... + 53752.

Almost surely, 2^18057808 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18057808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18671796).

18057808 is an abundant number, since it is smaller than the sum of its proper divisors (19285784).

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

18057808 is a wasteful number, since it uses less digits than its factorization.

18057808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 559 (or 553 counting only the distinct ones).

The product of its (nonzero) digits is 17920, while the sum is 37.

The square root of 18057808 is about 4249.4479641478. The cubic root of 18057808 is about 262.3543948355.

The spelling of 18057808 in words is "eighteen million, fifty-seven thousand, eight hundred eight".