18109732 has 12 divisors (see below), whose sum is σ = 31902976. Its totient is φ = 8994600.

The previous prime is 18109727. The next prime is 18109733. The reversal of 18109732 is 23790181.

It is a super-2 number, since 2×18109732² = 655924786223648, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18109694 and 18109703.

It is not an unprimeable number, because it can be changed into a prime (18109733) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14388 + ... + 15595.

Almost surely, 2^18109732 is an apocalyptic number.

It is an amenable number.

18109732 is a deficient number, since it is larger than the sum of its proper divisors (13793244).

18109732 is a wasteful number, since it uses less digits than its factorization.

18109732 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30138 (or 30136 counting only the distinct ones).

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 18109732 is about 4255.5530780382. The cubic root of 18109732 is about 262.6056149461.

The spelling of 18109732 in words is "eighteen million, one hundred nine thousand, seven hundred thirty-two".