722431 has 2 divisors, whose sum is σ = 722432. Its totient is φ = 722430.

The previous prime is 722417. The next prime is 722459. The reversal of 722431 is 134227.

It is a weak prime.

It is an emirp because it is prime and its reverse (134227) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-722431 is a prime.

It is a super-2 number, since 2×722431² = 1043813099522, which contains 22 as substring.

It is a Chen prime.

722431 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 722399 and 722408.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (722411) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 361215 + 361216.

It is an arithmetic number, because the mean of its divisors is an integer number (361216).

2⁷²²⁴³¹ is an apocalyptic number.

722431 is a deficient number, since it is larger than the sum of its proper divisors (1).

722431 is an equidigital number, since it uses as much as digits as its factorization.

722431 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 336, while the sum is 19.

The square root of 722431 is about 849.9594107956. The cubic root of 722431 is about 89.7288547160.

Adding to 722431 its reverse (134227), we get a palindrome (856658).

The spelling of 722431 in words is "seven hundred twenty-two thousand, four hundred thirty-one".