16394639 has 2 divisors, whose sum is σ = 16394640. Its totient is φ = 16394638.

The previous prime is 16394617. The next prime is 16394641. The reversal of 16394639 is 93649361.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 16394639 - 2²⁰ = 15346063 is a prime.

It is a Sophie Germain prime.

Together with 16394641, it forms a pair of twin primes.

It is a Chen prime.

It is a junction number, because it is equal to n+sod(n) for n = 16394596 and 16394605.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16394669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8197319 + 8197320.

It is an arithmetic number, because the mean of its divisors is an integer number (8197320).

Almost surely, 2^16394639 is an apocalyptic number.

16394639 is a deficient number, since it is larger than the sum of its proper divisors (1).

16394639 is an equidigital number, since it uses as much as digits as its factorization.

16394639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 104976, while the sum is 41.

The square root of 16394639 is about 4049.0293898662. The cubic root of 16394639 is about 254.0391315493.

The spelling of 16394639 in words is "sixteen million, three hundred ninety-four thousand, six hundred thirty-nine".