16397909 has 16 divisors (see below), whose sum is σ = 18555264. Its totient is φ = 14361600.

The previous prime is 16397903. The next prime is 16397933. The reversal of 16397909 is 90979361.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-16397909 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 16397909.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16397903) 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, 46277 + ... + 46629.

It is an arithmetic number, because the mean of its divisors is an integer number (1159704).

Almost surely, 2^16397909 is an apocalyptic number.

It is an amenable number.

16397909 is a deficient number, since it is larger than the sum of its proper divisors (2157355).

16397909 is a wasteful number, since it uses less digits than its factorization.

16397909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 508.

The product of its (nonzero) digits is 91854, while the sum is 44.

The square root of 16397909 is about 4049.4331702104. The cubic root of 16397909 is about 254.0560202558.

The spelling of 16397909 in words is "sixteen million, three hundred ninety-seven thousand, nine hundred nine".