18129356 has 12 divisors (see below), whose sum is σ = 36258768. Its totient is φ = 7769712.

The previous prime is 18129337. The next prime is 18129409. The reversal of 18129356 is 65392181.

18129356 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 323711 + ... + 323766.

It is an arithmetic number, because the mean of its divisors is an integer number (3021564).

Almost surely, 2^18129356 is an apocalyptic number.

It is an amenable number.

18129356 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

18129356 is a wasteful number, since it uses less digits than its factorization.

18129356 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647488 (or 647486 counting only the distinct ones).

The product of its digits is 12960, while the sum is 35.

The square root of 18129356 is about 4257.8581470030. The cubic root of 18129356 is about 262.7004352759.

The spelling of 18129356 in words is "eighteen million, one hundred twenty-nine thousand, three hundred fifty-six".