722217 has 4 divisors (see below), whose sum is σ = 962960. Its totient is φ = 481476.

The previous prime is 722213. The next prime is 722237. The reversal of 722217 is 712227.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 712227 = 3 ⋅237409.

It is not a de Polignac number, because 722217 - 2² = 722213 is a prime.

It is a D-number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 722193 and 722202.

It is not an unprimeable number, because it can be changed into a prime (722213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 120367 + ... + 120372.

It is an arithmetic number, because the mean of its divisors is an integer number (240740).

2⁷²²²¹⁷ is an apocalyptic number.

It is an amenable number.

722217 is a deficient number, since it is larger than the sum of its proper divisors (240743).

722217 is a wasteful number, since it uses less digits than its factorization.

722217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240742.

The product of its digits is 392, while the sum is 21.

The square root of 722217 is about 849.8335131071. The cubic root of 722217 is about 89.7199939522.

It can be divided in two parts, 722 and 217, that added together give a palindrome (939).

The spelling of 722217 in words is "seven hundred twenty-two thousand, two hundred seventeen", and thus it is an iban number.