18005916 has 48 divisors (see below), whose sum is σ = 43904000. Its totient is φ = 5736960.

The previous prime is 18005909. The next prime is 18005927. The reversal of 18005916 is 61950081.

It is a happy number.

It is a plaindrome in base 14.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35835 + ... + 36333.

Almost surely, 2^18005916 is an apocalyptic number.

It is an amenable number.

18005916 is an abundant number, since it is smaller than the sum of its proper divisors (25898084).

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

18005916 is a wasteful number, since it uses less digits than its factorization.

18005916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 634 (or 632 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 30.

The square root of 18005916 is about 4243.3378371277. The cubic root of 18005916 is about 262.1028479539.

Adding to 18005916 its reverse (61950081), we get a palindrome (79955997).

The spelling of 18005916 in words is "eighteen million, five thousand, nine hundred sixteen".