868239 has 16 divisors (see below), whose sum is σ = 1305440. Its totient is φ = 577368.

The previous prime is 868229. The next prime is 868249. The reversal of 868239 is 932868.

It is an interprime number because it is at equal distance from previous prime (868229) and next prime (868249).

It is not a de Polignac number, because 868239 - 2⁷ = 868111 is a prime.

It is a super-2 number, since 2×868239² = 1507677922242, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (868229) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1989 + ... + 2385.

It is an arithmetic number, because the mean of its divisors is an integer number (81590).

2⁸⁶⁸²³⁹ is an apocalyptic number.

868239 is a deficient number, since it is larger than the sum of its proper divisors (437201).

868239 is an frugal number, since it uses more digits than its factorization.

868239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418 (or 400 counting only the distinct ones).

The product of its digits is 20736, while the sum is 36.

The square root of 868239 is about 931.7934320438. The cubic root of 868239 is about 95.3995727998.

The spelling of 868239 in words is "eight hundred sixty-eight thousand, two hundred thirty-nine".