868939 has 2 divisors, whose sum is σ = 868940. Its totient is φ = 868938.

The previous prime is 868937. The next prime is 868943. The reversal of 868939 is 939868.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 868939 - 2¹ = 868937 is a prime.

Together with 868937, it forms a pair of twin primes.

868939 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 868895 and 868904.

It is not a weakly prime, because it can be changed into another prime (868937) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 434469 + 434470.

It is an arithmetic number, because the mean of its divisors is an integer number (434470).

2⁸⁶⁸⁹³⁹ is an apocalyptic number.

868939 is a deficient number, since it is larger than the sum of its proper divisors (1).

868939 is an equidigital number, since it uses as much as digits as its factorization.

868939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 93312, while the sum is 43.

The square root of 868939 is about 932.1689760982. The cubic root of 868939 is about 95.4252039000.

It can be divided in two parts, 86 and 8939, that added together give a square (9025 = 95²).

The spelling of 868939 in words is "eight hundred sixty-eight thousand, nine hundred thirty-nine".