861508 has 12 divisors (see below), whose sum is σ = 1548652. Its totient is φ = 419040.

The previous prime is 861499. The next prime is 861541. The reversal of 861508 is 805168.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 760384 + 101124 = 872^2 + 318^2 .

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2763 + ... + 3058.

2⁸⁶¹⁵⁰⁸ is an apocalyptic number.

It is an amenable number.

861508 is a deficient number, since it is larger than the sum of its proper divisors (687144).

861508 is a wasteful number, since it uses less digits than its factorization.

861508 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5862 (or 5860 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 28.

The square root of 861508 is about 928.1745525492. The cubic root of 861508 is about 95.1524054164.

It can be divided in two parts, 861 and 508, that added together give a square (1369 = 37²).

The spelling of 861508 in words is "eight hundred sixty-one thousand, five hundred eight".