16396909 has 4 divisors (see below), whose sum is σ = 16467516. Its totient is φ = 16326304.

The previous prime is 16396903. The next prime is 16396927. The reversal of 16396909 is 90969361.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1108809 + 15288100 = 1053^2 + 3910^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16396909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16396903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34954 + ... + 35419.

It is an arithmetic number, because the mean of its divisors is an integer number (4116879).

Almost surely, 2^16396909 is an apocalyptic number.

It is an amenable number.

16396909 is a deficient number, since it is larger than the sum of its proper divisors (70607).

16396909 is an equidigital number, since it uses as much as digits as its factorization.

16396909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70606.

The product of its (nonzero) digits is 78732, while the sum is 43.

The square root of 16396909 is about 4049.3096942565. The cubic root of 16396909 is about 254.0508557521.

The spelling of 16396909 in words is "sixteen million, three hundred ninety-six thousand, nine hundred nine".