839957 has 2 divisors, whose sum is σ = 839958. Its totient is φ = 839956.

The previous prime is 839921. The next prime is 839959. The reversal of 839957 is 759938.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 568516 + 271441 = 754^2 + 521^2 .

It is a cyclic number.

It is not a de Polignac number, because 839957 - 2¹⁴ = 823573 is a prime.

Together with 839959, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (839959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 419978 + 419979.

It is an arithmetic number, because the mean of its divisors is an integer number (419979).

2⁸³⁹⁹⁵⁷ is an apocalyptic number.

It is an amenable number.

839957 is a deficient number, since it is larger than the sum of its proper divisors (1).

839957 is an equidigital number, since it uses as much as digits as its factorization.

839957 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 68040, while the sum is 41.

The square root of 839957 is about 916.4916802677. The cubic root of 839957 is about 94.3522695722.

The spelling of 839957 in words is "eight hundred thirty-nine thousand, nine hundred fifty-seven".