16398865 has 16 divisors (see below), whose sum is σ = 22717440. Its totient is φ = 11131200.

The previous prime is 16398859. The next prime is 16398869. The reversal of 16398865 is 56889361.

16398865 is digitally balanced in base 2 and base 8, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 16398865 - 2³ = 16398857 is a prime.

16398865 is strictly pandigital in base 8.

It is not an unprimeable number, because it can be changed into a prime (16398869) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1216 + ... + 5854.

It is an arithmetic number, because the mean of its divisors is an integer number (1419840).

Almost surely, 2^16398865 is an apocalyptic number.

It is an amenable number.

16398865 is a deficient number, since it is larger than the sum of its proper divisors (6318575).

16398865 is a wasteful number, since it uses less digits than its factorization.

16398865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4752.

The product of its digits is 311040, while the sum is 46.

The square root of 16398865 is about 4049.5512097021. The cubic root of 16398865 is about 254.0609573250.

The spelling of 16398865 in words is "sixteen million, three hundred ninety-eight thousand, eight hundred sixty-five".