722018 has 16 divisors (see below), whose sum is σ = 1214784. Its totient is φ = 318960.

The previous prime is 722011. The next prime is 722023. The reversal of 722018 is 810227.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (722011) by changing a digit.

722018 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 (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 371 + ... + 1257.

It is an arithmetic number, because the mean of its divisors is an integer number (75924).

2⁷²²⁰¹⁸ is an apocalyptic number.

722018 is a deficient number, since it is larger than the sum of its proper divisors (492766).

722018 is a wasteful number, since it uses less digits than its factorization.

722018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 937.

The product of its (nonzero) digits is 224, while the sum is 20.

The square root of 722018 is about 849.7164232849. The cubic root of 722018 is about 89.7117526993.

Subtracting 722018 from its reverse (810227), we obtain a square (88209 = 297²).

The spelling of 722018 in words is "seven hundred twenty-two thousand, eighteen".