715639 has 2 divisors, whose sum is σ = 715640. Its totient is φ = 715638.

The previous prime is 715621. The next prime is 715643. The reversal of 715639 is 936517.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-715639 is a prime.

It is a Chen prime.

715639 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 715639.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (715679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 357819 + 357820.

It is an arithmetic number, because the mean of its divisors is an integer number (357820).

2⁷¹⁵⁶³⁹ is an apocalyptic number.

715639 is a deficient number, since it is larger than the sum of its proper divisors (1).

715639 is an equidigital number, since it uses as much as digits as its factorization.

715639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5670, while the sum is 31.

The square root of 715639 is about 845.9544905017. The cubic root of 715639 is about 89.4467708831.

The spelling of 715639 in words is "seven hundred fifteen thousand, six hundred thirty-nine".