16399939 has 2 divisors, whose sum is σ = 16399940. Its totient is φ = 16399938.

The previous prime is 16399937. The next prime is 16399967. The reversal of 16399939 is 93999361.

It is a happy number.

It is a weak prime.

It is an emirp because it is prime and its reverse (93999361) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16399939 - 2¹ = 16399937 is a prime.

Together with 16399937, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 16399892 and 16399901.

It is not a weakly prime, because it can be changed into another prime (16399931) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8199969 + 8199970.

It is an arithmetic number, because the mean of its divisors is an integer number (8199970).

Almost surely, 2^16399939 is an apocalyptic number.

16399939 is a deficient number, since it is larger than the sum of its proper divisors (1).

16399939 is an equidigital number, since it uses as much as digits as its factorization.

16399939 is an evil number, because the sum of its binary digits is even.

The product of its digits is 354294, while the sum is 49.

The square root of 16399939 is about 4049.6838148181. The cubic root of 16399939 is about 254.0665035526.

The spelling of 16399939 in words is "sixteen million, three hundred ninety-nine thousand, nine hundred thirty-nine".