865997 has 12 divisors (see below), whose sum is σ = 1010268. Its totient is φ = 739200.

The previous prime is 865993. The next prime is 866003. The reversal of 865997 is 799568.

It can be written as a sum of positive squares in 2 ways, for example, as 256036 + 609961 = 506^2 + 781^2 .

It is not a de Polignac number, because 865997 - 2² = 865993 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (865993) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1847 + ... + 2267.

It is an arithmetic number, because the mean of its divisors is an integer number (84189).

2⁸⁶⁵⁹⁹⁷ is an apocalyptic number.

It is an amenable number.

865997 is a deficient number, since it is larger than the sum of its proper divisors (144271).

865997 is a wasteful number, since it uses less digits than its factorization.

865997 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 460 (or 449 counting only the distinct ones).

The product of its digits is 136080, while the sum is 44.

The square root of 865997 is about 930.5895980506. The cubic root of 865997 is about 95.3173872080.

The spelling of 865997 in words is "eight hundred sixty-five thousand, nine hundred ninety-seven".