18009968 has 20 divisors (see below), whose sum is σ = 35051328. Its totient is φ = 8964480.

The previous prime is 18009949. The next prime is 18009973. The reversal of 18009968 is 86990081.

It is a super-2 number, since 2×18009968² = 648717894722048, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1313 + ... + 6143.

Almost surely, 2^18009968 is an apocalyptic number.

It is an amenable number.

18009968 is a deficient number, since it is larger than the sum of its proper divisors (17041360).

18009968 is a wasteful number, since it uses less digits than its factorization.

18009968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5072 (or 5066 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 41.

The square root of 18009968 is about 4243.8152645939. The cubic root of 18009968 is about 262.1225074385.

The spelling of 18009968 in words is "eighteen million, nine thousand, nine hundred sixty-eight".