18357018 has 16 divisors (see below), whose sum is σ = 37217856. Its totient is φ = 6035040.

The previous prime is 18356999. The next prime is 18357023. The reversal of 18357018 is 81075381.

It is a self number, because there is not a number n which added to its sum of digits gives 18357018.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20518 + ... + 21393.

It is an arithmetic number, because the mean of its divisors is an integer number (2326116).

Almost surely, 2^18357018 is an apocalyptic number.

18357018 is an abundant number, since it is smaller than the sum of its proper divisors (18860838).

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

18357018 is a wasteful number, since it uses less digits than its factorization.

18357018 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41989.

The product of its (nonzero) digits is 6720, while the sum is 33.

The square root of 18357018 is about 4284.5090733945. The cubic root of 18357018 is about 263.7954970441.

The spelling of 18357018 in words is "eighteen million, three hundred fifty-seven thousand, eighteen".