18642408 has 32 divisors (see below), whose sum is σ = 48111360. Its totient is φ = 6013440.

The previous prime is 18642391. The next prime is 18642427. The reversal of 18642408 is 80424681.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11785 + ... + 13272.

It is an arithmetic number, because the mean of its divisors is an integer number (1503480).

Almost surely, 2^18642408 is an apocalyptic number.

It is an amenable number.

18642408 is an abundant number, since it is smaller than the sum of its proper divisors (29468952).

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

18642408 is a wasteful number, since it uses less digits than its factorization.

18642408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25097 (or 25093 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 33.

The square root of 18642408 is about 4317.6854910936. The cubic root of 18642408 is about 265.1555180656.

The spelling of 18642408 in words is "eighteen million, six hundred forty-two thousand, four hundred eight".