18406144 has 18 divisors (see below), whose sum is σ = 36740900. Its totient is φ = 9202944.

The previous prime is 18406109. The next prime is 18406153. The reversal of 18406144 is 44160481.

It is a super-2 number, since 2×18406144² = 677572273897472, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 35694 + ... + 36205.

Almost surely, 2^18406144 is an apocalyptic number.

It is an amenable number.

18406144 is a deficient number, since it is larger than the sum of its proper divisors (18334756).

18406144 is an frugal number, since it uses more digits than its factorization.

18406144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71915 (or 71901 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 18406144 is about 4290.2382218241. The cubic root of 18406144 is about 264.0306055733.

The spelling of 18406144 in words is "eighteen million, four hundred six thousand, one hundred forty-four".