861516 has 30 divisors (see below), whose sum is σ = 2253020. Its totient is φ = 287064.

The previous prime is 861499. The next prime is 861541. The reversal of 861516 is 615168.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 861516.

It is an unprimeable number.

861516 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1006 + ... + 1653.

2⁸⁶¹⁵¹⁶ is an apocalyptic number.

It is an amenable number.

861516 is an abundant number, since it is smaller than the sum of its proper divisors (1391504).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

861516 is a wasteful number, since it uses less digits than its factorization.

861516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2675 (or 2664 counting only the distinct ones).

The product of its digits is 1440, while the sum is 27.

The square root of 861516 is about 928.1788620735. The cubic root of 861516 is about 95.1526999452.

The spelling of 861516 in words is "eight hundred sixty-one thousand, five hundred sixteen".