865359889 has 9 divisors (see below), whose sum is σ = 905327913. Its totient is φ = 827088372.

The previous prime is 865359871. The next prime is 865359893. The reversal of 865359889 is 988953568.

The square root of 865359889 is 29417.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 865359889 - 2⁹ = 865359377 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (865351889) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 675952 + ... + 677230.

Almost surely, 2^865359889 is an apocalyptic number.

865359889 is the 29417-th square number.

865359889 is the 14709-th centered octagonal number.

It is an amenable number.

865359889 is a deficient number, since it is larger than the sum of its proper divisors (39968024).

865359889 is an frugal number, since it uses more digits than its factorization.

865359889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2604 (or 1302 counting only the distinct ones).

The product of its digits is 18662400, while the sum is 61.

The cubic root of 865359889 is about 952.9400658257.

The spelling of 865359889 in words is "eight hundred sixty-five million, three hundred fifty-nine thousand, eight hundred eighty-nine".