722918 has 8 divisors (see below), whose sum is σ = 1239312. Its totient is φ = 309816.

The previous prime is 722903. The next prime is 722921. The reversal of 722918 is 819227.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×722918² = 1045220869448, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

722918 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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, 25805 + ... + 25832.

It is an arithmetic number, because the mean of its divisors is an integer number (154914).

2⁷²²⁹¹⁸ is an apocalyptic number.

722918 is a deficient number, since it is larger than the sum of its proper divisors (516394).

722918 is a wasteful number, since it uses less digits than its factorization.

722918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51646.

The product of its digits is 2016, while the sum is 29.

The square root of 722918 is about 850.2458467996. The cubic root of 722918 is about 89.7490126442.

The spelling of 722918 in words is "seven hundred twenty-two thousand, nine hundred eighteen".