861172 has 12 divisors (see below), whose sum is σ = 1623076. Its totient is φ = 397440.

The previous prime is 861167. The next prime is 861191. The reversal of 861172 is 271168.

It can be written as a sum of positive squares in 2 ways, for example, as 76176 + 784996 = 276^2 + 886^2 .

It is a hoax number, since the sum of its digits (25) coincides with the sum of the digits of its distinct prime factors.

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 3 ways as a sum of consecutive naturals, for example, 8229 + ... + 8332.

2⁸⁶¹¹⁷² is an apocalyptic number.

It is an amenable number.

861172 is a deficient number, since it is larger than the sum of its proper divisors (761904).

861172 is a wasteful number, since it uses less digits than its factorization.

861172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16578 (or 16576 counting only the distinct ones).

The product of its digits is 672, while the sum is 25.

The square root of 861172 is about 927.9935344602. The cubic root of 861172 is about 95.1400335577.

The spelling of 861172 in words is "eight hundred sixty-one thousand, one hundred seventy-two".