18408356 has 12 divisors (see below), whose sum is σ = 32510940. Its totient is φ = 9119520.

The previous prime is 18408347. The next prime is 18408371. The reversal of 18408356 is 65380481.

It can be written as a sum of positive squares in 2 ways, for example, as 16128256 + 2280100 = 4016^2 + 1510^2 .

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 20675 + ... + 21546.

It is an arithmetic number, because the mean of its divisors is an integer number (2709245).

Almost surely, 2^18408356 is an apocalyptic number.

It is an amenable number.

18408356 is a deficient number, since it is larger than the sum of its proper divisors (14102584).

18408356 is a wasteful number, since it uses less digits than its factorization.

18408356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42334 (or 42332 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 18408356 is about 4290.4960086218. The cubic root of 18408356 is about 264.0411819747.

The spelling of 18408356 in words is "eighteen million, four hundred eight thousand, three hundred fifty-six".