16399389 has 16 divisors (see below), whose sum is σ = 22482432. Its totient is φ = 10629168.

The previous prime is 16399363. The next prime is 16399393. The reversal of 16399389 is 98399361.

It is a happy number.

It is not a de Polignac number, because 16399389 - 2⁸ = 16399133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16399289) 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, 16192 + ... + 17174.

It is an arithmetic number, because the mean of its divisors is an integer number (1405152).

Almost surely, 2^16399389 is an apocalyptic number.

It is an amenable number.

16399389 is a deficient number, since it is larger than the sum of its proper divisors (6083043).

16399389 is an equidigital number, since it uses as much as digits as its factorization.

16399389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1136.

The product of its digits is 314928, while the sum is 48.

The square root of 16399389 is about 4049.6159077127. The cubic root of 16399389 is about 254.0636633359.

The spelling of 16399389 in words is "sixteen million, three hundred ninety-nine thousand, three hundred eighty-nine".