16399959 has 16 divisors (see below), whose sum is σ = 22573824. Its totient is φ = 10584000.

The previous prime is 16399939. The next prime is 16399967. The reversal of 16399959 is 95999361.

It is not a de Polignac number, because 16399959 - 2²⁰ = 15351383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16399909) 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, 18132 + ... + 19014.

It is an arithmetic number, because the mean of its divisors is an integer number (1410864).

Almost surely, 2^16399959 is an apocalyptic number.

16399959 is a deficient number, since it is larger than the sum of its proper divisors (6173865).

16399959 is a wasteful number, since it uses less digits than its factorization.

16399959 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1078.

The product of its digits is 590490, while the sum is 51.

The square root of 16399959 is about 4049.6862841460. The cubic root of 16399959 is about 254.0666068320.

The spelling of 16399959 in words is "sixteen million, three hundred ninety-nine thousand, nine hundred fifty-nine".