16399659 has 8 divisors (see below), whose sum is σ = 21978000. Its totient is φ = 10877216.

The previous prime is 16399619. The next prime is 16399661. The reversal of 16399659 is 95699361.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 16399659 - 2¹¹ = 16397611 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16399609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13284 + ... + 14465.

It is an arithmetic number, because the mean of its divisors is an integer number (2747250).

Almost surely, 2^16399659 is an apocalyptic number.

16399659 is a deficient number, since it is larger than the sum of its proper divisors (5578341).

16399659 is a wasteful number, since it uses less digits than its factorization.

16399659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27949.

The product of its digits is 393660, while the sum is 48.

The square root of 16399659 is about 4049.6492440704. The cubic root of 16399659 is about 254.0650576320.

The spelling of 16399659 in words is "sixteen million, three hundred ninety-nine thousand, six hundred fifty-nine".