722440 has 16 divisors (see below), whose sum is σ = 1625580. Its totient is φ = 288960.

The previous prime is 722431. The next prime is 722459. The reversal of 722440 is 44227.

It can be written as a sum of positive squares in 2 ways, for example, as 715716 + 6724 = 846^2 + 82^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8991 + ... + 9070.

2⁷²²⁴⁴⁰ is an apocalyptic number.

It is an amenable number.

722440 is an abundant number, since it is smaller than the sum of its proper divisors (903140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

722440 is a wasteful number, since it uses less digits than its factorization.

722440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18072 (or 18068 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 19.

The square root of 722440 is about 849.9647051496. The cubic root of 722440 is about 89.7292273266.

Adding to 722440 its reverse (44227), we get a palindrome (766667).

It can be divided in two parts, 7 and 22440, that multiplied together give a triangular number (157080 = T₅₆₀).

The spelling of 722440 in words is "seven hundred twenty-two thousand, four hundred forty", and thus it is an iban number.