658639 has 2 divisors, whose sum is σ = 658640. Its totient is φ = 658638.

The previous prime is 658633. The next prime is 658643. The reversal of 658639 is 936856.

658639 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 658639 - 2⁵ = 658607 is a prime.

It is a super-3 number, since 3×658639³ = 857163330823713357, which contains 333 as substring.

It is a Chen prime.

658639 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 658598 and 658607.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (658633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 329319 + 329320.

It is an arithmetic number, because the mean of its divisors is an integer number (329320).

2⁶⁵⁸⁶³⁹ is an apocalyptic number.

658639 is a deficient number, since it is larger than the sum of its proper divisors (1).

658639 is an equidigital number, since it uses as much as digits as its factorization.

658639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880, while the sum is 37.

The square root of 658639 is about 811.5657705941. The cubic root of 658639 is about 87.0059889302.

The spelling of 658639 in words is "six hundred fifty-eight thousand, six hundred thirty-nine".