865381489 has 16 divisors (see below), whose sum is σ = 1035457920. Its totient is φ = 707535360.

The previous prime is 865381471. The next prime is 865381529. The reversal of 865381489 is 984183568.

865381489 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 865381489 - 2⁵ = 865381457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (865381469) 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, 8832 + ... + 42529.

It is an arithmetic number, because the mean of its divisors is an integer number (64716120).

Almost surely, 2^865381489 is an apocalyptic number.

It is an amenable number.

865381489 is a deficient number, since it is larger than the sum of its proper divisors (170076431).

865381489 is a wasteful number, since it uses less digits than its factorization.

865381489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51480.

The product of its digits is 1658880, while the sum is 52.

The square root of 865381489 is about 29417.3671323591. The cubic root of 865381489 is about 952.9479944476.

The spelling of 865381489 in words is "eight hundred sixty-five million, three hundred eighty-one thousand, four hundred eighty-nine".