18690408 has 48 divisors (see below), whose sum is σ = 55224000. Its totient is φ = 5663520.

The previous prime is 18690407. The next prime is 18690431. The reversal of 18690408 is 80409681.

It is a happy number.

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 (18690407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 11008 + ... + 12591.

It is an arithmetic number, because the mean of its divisors is an integer number (1150500).

Almost surely, 2^18690408 is an apocalyptic number.

18690408 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18690408 is an abundant number, since it is smaller than the sum of its proper divisors (36533592).

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

18690408 is a wasteful number, since it uses less digits than its factorization.

18690408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23622 (or 23615 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The square root of 18690408 is about 4323.2404513281. The cubic root of 18690408 is about 265.3828949333.

The spelling of 18690408 in words is "eighteen million, six hundred ninety thousand, four hundred eight".