18728812 has 6 divisors (see below), whose sum is σ = 32775428. Its totient is φ = 9364404.

The previous prime is 18728803. The next prime is 18728821. The reversal of 18728812 is 21882781.

It is an interprime number because it is at equal distance from previous prime (18728803) and next prime (18728821).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2341098 + ... + 2341105.

Almost surely, 2^18728812 is an apocalyptic number.

It is an amenable number.

18728812 is a deficient number, since it is larger than the sum of its proper divisors (14046616).

18728812 is a wasteful number, since it uses less digits than its factorization.

18728812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4682207 (or 4682205 counting only the distinct ones).

The product of its digits is 14336, while the sum is 37.

The square root of 18728812 is about 4327.6797478557. The cubic root of 18728812 is about 265.5645352016.

The spelling of 18728812 in words is "eighteen million, seven hundred twenty-eight thousand, eight hundred twelve".