16042399 has 2 divisors, whose sum is σ = 16042400. Its totient is φ = 16042398.

The previous prime is 16042393. The next prime is 16042427. The reversal of 16042399 is 99324061.

It is a weak prime.

It is an emirp because it is prime and its reverse (99324061) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 16042399 - 2⁹ = 16041887 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (16042393) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8021199 + 8021200.

It is an arithmetic number, because the mean of its divisors is an integer number (8021200).

Almost surely, 2^16042399 is an apocalyptic number.

16042399 is a deficient number, since it is larger than the sum of its proper divisors (1).

16042399 is an equidigital number, since it uses as much as digits as its factorization.

16042399 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 16042399 is about 4005.2963685600. The cubic root of 16042399 is about 252.2065944620.

The spelling of 16042399 in words is "sixteen million, forty-two thousand, three hundred ninety-nine".