16400044 has 6 divisors (see below), whose sum is σ = 28700084. Its totient is φ = 8200020.

The previous prime is 16400017. The next prime is 16400047. The reversal of 16400044 is 44000461.

It is a super-2 number, since 2×16400044² = 537922886403872, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 16399994 and 16400030.

It is not an unprimeable number, because it can be changed into a prime (16400047) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2050002 + ... + 2050009.

Almost surely, 2^16400044 is an apocalyptic number.

It is an amenable number.

16400044 is a deficient number, since it is larger than the sum of its proper divisors (12300040).

16400044 is a wasteful number, since it uses less digits than its factorization.

16400044 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4100015 (or 4100013 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 19.

The square root of 16400044 is about 4049.6967787725. The cubic root of 16400044 is about 254.0670457685.

The spelling of 16400044 in words is "sixteen million, four hundred thousand, forty-four".