722131389 has 64 divisors (see below), whose sum is σ = 1300492800. Its totient is φ = 386601984.

The previous prime is 722131381. The next prime is 722131393. The reversal of 722131389 is 983131227.

It is not a de Polignac number, because 722131389 - 2³ = 722131381 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (722131381) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1018167 + ... + 1018875.

It is an arithmetic number, because the mean of its divisors is an integer number (20320200).

Almost surely, 2^722131389 is an apocalyptic number.

It is an amenable number.

722131389 is a deficient number, since it is larger than the sum of its proper divisors (578361411).

722131389 is a wasteful number, since it uses less digits than its factorization.

722131389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1059 (or 1053 counting only the distinct ones).

The product of its digits is 18144, while the sum is 36.

The square root of 722131389 is about 26872.5024699971. The cubic root of 722131389 is about 897.1644870108.

The spelling of 722131389 in words is "seven hundred twenty-two million, one hundred thirty-one thousand, three hundred eighty-nine".