18408129 has 16 divisors (see below), whose sum is σ = 25331712. Its totient is φ = 11881728.

The previous prime is 18408121. The next prime is 18408133. The reversal of 18408129 is 92180481.

It is not a de Polignac number, because 18408129 - 2³ = 18408121 is a prime.

It is a nialpdrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 18408129.

It is not an unprimeable number, because it can be changed into a prime (18408121) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42297 + ... + 42729.

It is an arithmetic number, because the mean of its divisors is an integer number (1583232).

Almost surely, 2^18408129 is an apocalyptic number.

It is an amenable number.

18408129 is a deficient number, since it is larger than the sum of its proper divisors (6923583).

18408129 is a wasteful number, since it uses less digits than its factorization.

18408129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 856.

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 18408129 is about 4290.4695547224. The cubic root of 18408129 is about 264.0400966416.

The spelling of 18408129 in words is "eighteen million, four hundred eight thousand, one hundred twenty-nine".