18105992 has 8 divisors (see below), whose sum is σ = 33948750. Its totient is φ = 9052992.

The previous prime is 18105977. The next prime is 18106027. The reversal of 18105992 is 29950181.

It can be written as a sum of positive squares in only one way, i.e., 11062276 + 7043716 = 3326^2 + 2654^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a plaindrome in base 16.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1131617 + ... + 1131632.

Almost surely, 2^18105992 is an apocalyptic number.

It is an amenable number.

18105992 is a deficient number, since it is larger than the sum of its proper divisors (15842758).

18105992 is a wasteful number, since it uses less digits than its factorization.

18105992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2263255 (or 2263251 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 35.

The square root of 18105992 is about 4255.1136295051. The cubic root of 18105992 is about 262.5875360366.

The spelling of 18105992 in words is "eighteen million, one hundred five thousand, nine hundred ninety-two".