722187 has 12 divisors (see below), whose sum is σ = 1079520. Its totient is φ = 464688.

The previous prime is 722173. The next prime is 722213. The reversal of 722187 is 781227.

722187 is nontrivially palindromic in base 16.

It is not a de Polignac number, because 722187 - 2⁶ = 722123 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 722187.

It is not an unprimeable number, because it can be changed into a prime (722147) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1123 + ... + 1644.

It is an arithmetic number, because the mean of its divisors is an integer number (89960).

2⁷²²¹⁸⁷ is an apocalyptic number.

722187 is a deficient number, since it is larger than the sum of its proper divisors (357333).

722187 is a wasteful number, since it uses less digits than its factorization.

722187 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2802 (or 2799 counting only the distinct ones).

The product of its digits is 1568, while the sum is 27.

The square root of 722187 is about 849.8158624079. The cubic root of 722187 is about 89.7187516492.

It can be divided in two parts, 722 and 187, that added together give a palindrome (909).

The spelling of 722187 in words is "seven hundred twenty-two thousand, one hundred eighty-seven".