16400065 has 16 divisors (see below), whose sum is σ = 22052160. Its totient is φ = 11603520.

The previous prime is 16400047. The next prime is 16400093. The reversal of 16400065 is 56000461.

It is not a de Polignac number, because 16400065 - 2⁷ = 16399937 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1995 + ... + 6064.

It is an arithmetic number, because the mean of its divisors is an integer number (1378260).

Almost surely, 2^16400065 is an apocalyptic number.

It is an amenable number.

16400065 is a deficient number, since it is larger than the sum of its proper divisors (5652095).

16400065 is a wasteful number, since it uses less digits than its factorization.

16400065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8112.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 16400065 is about 4049.6993715583. The cubic root of 16400065 is about 254.0671542114.

The spelling of 16400065 in words is "sixteen million, four hundred thousand, sixty-five".