864745 has 16 divisors (see below), whose sum is σ = 1225728. Its totient is φ = 573120.

The previous prime is 864737. The next prime is 864757. The reversal of 864745 is 547468.

It is not a de Polignac number, because 864745 - 2³ = 864737 is a prime.

Its product of digits (26880) is a multiple of the sum of its prime divisors (840).

864745 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 864745.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 687 + ... + 1483.

It is an arithmetic number, because the mean of its divisors is an integer number (76608).

2⁸⁶⁴⁷⁴⁵ is an apocalyptic number.

It is an amenable number.

864745 is a deficient number, since it is larger than the sum of its proper divisors (360983).

864745 is a wasteful number, since it uses less digits than its factorization.

864745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 840.

The product of its digits is 26880, while the sum is 34.

The square root of 864745 is about 929.9166629328. The cubic root of 864745 is about 95.2714305726.

Subtracting from 864745 its product of digits (26880), we obtain a triangular number (837865 = T₁₂₉₄).

The spelling of 864745 in words is "eight hundred sixty-four thousand, seven hundred forty-five".