18405964 has 12 divisors (see below), whose sum is σ = 32287864. Its totient is φ = 9180864.

The previous prime is 18405941. The next prime is 18405977. The reversal of 18405964 is 46950481.

It is a happy number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3582 + ... + 7045.

Almost surely, 2^18405964 is an apocalyptic number.

It is an amenable number.

18405964 is a deficient number, since it is larger than the sum of its proper divisors (13881900).

18405964 is a wasteful number, since it uses less digits than its factorization.

18405964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11064 (or 11062 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 37.

The square root of 18405964 is about 4290.2172439167. The cubic root of 18405964 is about 264.0297448885.

The spelling of 18405964 in words is "eighteen million, four hundred five thousand, nine hundred sixty-four".