866725 has 12 divisors (see below), whose sum is σ = 1104964. Its totient is φ = 673920.

The previous prime is 866717. The next prime is 866737. The reversal of 866725 is 527668.

It can be written as a sum of positive squares in 6 ways, for example, as 31329 + 835396 = 177^2 + 914^2 .

It is not a de Polignac number, because 866725 - 2³ = 866717 is a prime.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

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 11 ways as a sum of consecutive naturals, for example, 457 + ... + 1393.

2⁸⁶⁶⁷²⁵ is an apocalyptic number.

It is an amenable number.

866725 is a deficient number, since it is larger than the sum of its proper divisors (238239).

866725 is a wasteful number, since it uses less digits than its factorization.

866725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 984 (or 979 counting only the distinct ones).

The product of its digits is 20160, while the sum is 34.

The square root of 866725 is about 930.9806657498. The cubic root of 866725 is about 95.3440892337.

It can be divided in two parts, 86 and 6725, that multiplied together give a triangular number (578350 = T₁₀₇₅).

The spelling of 866725 in words is "eight hundred sixty-six thousand, seven hundred twenty-five".