18408474 has 24 divisors (see below), whose sum is σ = 45583200. Its totient is φ = 5259528.

The previous prime is 18408461. The next prime is 18408517. The reversal of 18408474 is 47480481.

It is a happy number.

18408474 is a `hidden beast` number, since 184 + 0 + 8 + 474 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 72924 + ... + 73175.

It is an arithmetic number, because the mean of its divisors is an integer number (1899300).

Almost surely, 2^18408474 is an apocalyptic number.

18408474 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

18408474 is an abundant number, since it is smaller than the sum of its proper divisors (27174726).

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

18408474 is a wasteful number, since it uses less digits than its factorization.

18408474 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 146114 (or 146111 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 36.

The square root of 18408474 is about 4290.5097599236. The cubic root of 18408474 is about 264.0417461532.

The spelling of 18408474 in words is "eighteen million, four hundred eight thousand, four hundred seventy-four".