860721 has 8 divisors (see below), whose sum is σ = 1158240. Its totient is φ = 568512.

The previous prime is 860701. The next prime is 860747. The reversal of 860721 is 127068.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 860721 - 2⁵ = 860689 is a prime.

It is an Ulam number.

It is a junction number, because it is equal to n+sod(n) for n = 860691 and 860700.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 860721.

It is not an unprimeable number, because it can be changed into a prime (860701) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 931 + ... + 1608.

It is an arithmetic number, because the mean of its divisors is an integer number (144780).

2⁸⁶⁰⁷²¹ is an apocalyptic number.

It is an amenable number.

860721 is a deficient number, since it is larger than the sum of its proper divisors (297519).

860721 is a wasteful number, since it uses less digits than its factorization.

860721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2655.

The product of its (nonzero) digits is 672, while the sum is 24.

The square root of 860721 is about 927.7505052545. The cubic root of 860721 is about 95.1234222235.

Adding to 860721 its reverse (127068), we get a palindrome (987789).

The spelling of 860721 in words is "eight hundred sixty thousand, seven hundred twenty-one".