722831 has 4 divisors (see below), whose sum is σ = 725592. Its totient is φ = 720072.

The previous prime is 722819. The next prime is 722833. The reversal of 722831 is 138227.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-722831 is a prime.

It is a super-2 number, since 2×722831² = 1044969309122, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 722797 and 722806.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 722831.

It is not an unprimeable number, because it can be changed into a prime (722833) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 941 + ... + 1526.

It is an arithmetic number, because the mean of its divisors is an integer number (181398).

2⁷²²⁸³¹ is an apocalyptic number.

722831 is a deficient number, since it is larger than the sum of its proper divisors (2761).

722831 is a wasteful number, since it uses less digits than its factorization.

722831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2760.

The product of its digits is 672, while the sum is 23.

The square root of 722831 is about 850.1946835872. The cubic root of 722831 is about 89.7454122002.

The spelling of 722831 in words is "seven hundred twenty-two thousand, eight hundred thirty-one".