18465918 has 16 divisors (see below), whose sum is σ = 38537856. Its totient is φ = 5887640.

The previous prime is 18465917. The next prime is 18465919. The reversal of 18465918 is 81956481.

It is an interprime number because it is at equal distance from previous prime (18465917) and next prime (18465919).

It is a self number, because there is not a number n which added to its sum of digits gives 18465918.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18465917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66768 + ... + 67043.

It is an arithmetic number, because the mean of its divisors is an integer number (2408616).

Almost surely, 2^18465918 is an apocalyptic number.

18465918 is an abundant number, since it is smaller than the sum of its proper divisors (20071938).

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

18465918 is a wasteful number, since it uses less digits than its factorization.

18465918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 133839.

The product of its digits is 69120, while the sum is 42.

The square root of 18465918 is about 4297.1988550683. The cubic root of 18465918 is about 264.3161100940.

The spelling of 18465918 in words is "eighteen million, four hundred sixty-five thousand, nine hundred eighteen".