18808812 has 36 divisors (see below), whose sum is σ = 51867816. Its totient is φ = 5699520.

The previous prime is 18808771. The next prime is 18808819. The reversal of 18808812 is 21880881.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

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

It is not an unprimeable number, because it can be changed into a prime (18808819) 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, 23353 + ... + 24144.

Almost surely, 2^18808812 is an apocalyptic number.

18808812 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18808812 is an abundant number, since it is smaller than the sum of its proper divisors (33059004).

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

18808812 is a wasteful number, since it uses less digits than its factorization.

18808812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47518 (or 47513 counting only the distinct ones).

The product of its (nonzero) digits is 8192, while the sum is 36.

The square root of 18808812 is about 4336.9127268139. The cubic root of 18808812 is about 265.9421171658.

The spelling of 18808812 in words is "eighteen million, eight hundred eight thousand, eight hundred twelve".