722139 has 16 divisors (see below), whose sum is σ = 1067520. Its totient is φ = 430560.

The previous prime is 722123. The next prime is 722147. The reversal of 722139 is 931227.

722139 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 722139 - 2⁴ = 722123 is a prime.

It is an Ulam number.

It is not an unprimeable number, because it can be changed into a prime (722119) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2469 + ... + 2745.

It is an arithmetic number, because the mean of its divisors is an integer number (66720).

2⁷²²¹³⁹ is an apocalyptic number.

722139 is a gapful number since it is divisible by the number (79) formed by its first and last digit.

722139 is a deficient number, since it is larger than the sum of its proper divisors (345381).

722139 is a wasteful number, since it uses less digits than its factorization.

722139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 370.

The product of its digits is 756, while the sum is 24.

The square root of 722139 is about 849.7876205264. The cubic root of 722139 is about 89.7167638928.

It can be divided in two parts, 7221 and 39, that added together give a triangular number (7260 = T₁₂₀).

The spelling of 722139 in words is "seven hundred twenty-two thousand, one hundred thirty-nine".