50399639 has 2 divisors, whose sum is σ = 50399640. Its totient is φ = 50399638.

The previous prime is 50399633. The next prime is 50399641. The reversal of 50399639 is 93699305.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 50399639 - 2⁸ = 50399383 is a prime.

It is a super-2 number, since 2×50399639² = 5080247222660642, which contains 22 as substring.

Together with 50399641, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 50399639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (50399633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 25199819 + 25199820.

It is an arithmetic number, because the mean of its divisors is an integer number (25199820).

Almost surely, 2^50399639 is an apocalyptic number.

50399639 is a deficient number, since it is larger than the sum of its proper divisors (1).

50399639 is an equidigital number, since it uses as much as digits as its factorization.

50399639 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 196830, while the sum is 44.

The square root of 50399639 is about 7099.2703146168. The cubic root of 50399639 is about 369.3820681612.

The spelling of 50399639 in words is "fifty million, three hundred ninety-nine thousand, six hundred thirty-nine".