16399401 has 8 divisors (see below), whose sum is σ = 21884640. Its totient is φ = 10923552.

The previous prime is 16399393. The next prime is 16399421. The reversal of 16399401 is 10499361.

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

It is not a de Polignac number, because 16399401 - 2³ = 16399393 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16399421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5190 + ... + 7728.

It is an arithmetic number, because the mean of its divisors is an integer number (2735580).

Almost surely, 2^16399401 is an apocalyptic number.

It is an amenable number.

16399401 is a deficient number, since it is larger than the sum of its proper divisors (5485239).

16399401 is a wasteful number, since it uses less digits than its factorization.

16399401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4695.

The product of its (nonzero) digits is 5832, while the sum is 33.

The square root of 16399401 is about 4049.6173893345. The cubic root of 16399401 is about 254.0637253050.

The spelling of 16399401 in words is "sixteen million, three hundred ninety-nine thousand, four hundred one".