865872397 has 8 divisors (see below), whose sum is σ = 932928920. Its totient is φ = 798880320.

The previous prime is 865872379. The next prime is 865872419. The reversal of 865872397 is 793278568.

It can be written as a sum of positive squares in 4 ways, for example, as 191379556 + 674492841 = 13834^2 + 25971^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 865872397 - 2⁷ = 865872269 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 (865872307) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13879 + ... + 43867.

It is an arithmetic number, because the mean of its divisors is an integer number (116616115).

Almost surely, 2^865872397 is an apocalyptic number.

It is an amenable number.

865872397 is a deficient number, since it is larger than the sum of its proper divisors (67056523).

865872397 is a wasteful number, since it uses less digits than its factorization.

865872397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32223.

The product of its digits is 5080320, while the sum is 55.

The square root of 865872397 is about 29425.7097960270. The cubic root of 865872397 is about 953.1281544384.

The spelling of 865872397 in words is "eight hundred sixty-five million, eight hundred seventy-two thousand, three hundred ninety-seven".