722318 has 4 divisors (see below), whose sum is σ = 1083480. Its totient is φ = 361158.

The previous prime is 722317. The next prime is 722321. The reversal of 722318 is 813227.

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

It is a junction number, because it is equal to n+sod(n) for n = 722293 and 722302.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (722311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 180578 + ... + 180581.

It is an arithmetic number, because the mean of its divisors is an integer number (270870).

2⁷²²³¹⁸ is an apocalyptic number.

722318 is a deficient number, since it is larger than the sum of its proper divisors (361162).

722318 is a wasteful number, since it uses less digits than its factorization.

722318 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 361161.

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

The square root of 722318 is about 849.8929344335. The cubic root of 722318 is about 89.7241761195.

Subtracting 722318 from its reverse (813227), we obtain a palindrome (90909).

The spelling of 722318 in words is "seven hundred twenty-two thousand, three hundred eighteen".