721444 has 6 divisors (see below), whose sum is σ = 1262534. Its totient is φ = 360720.

The previous prime is 721439. The next prime is 721451. The reversal of 721444 is 444127.

It can be written as a sum of positive squares in only one way, i.e., 624100 + 97344 = 790^2 + 312^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 90177 + ... + 90184.

2⁷²¹⁴⁴⁴ is an apocalyptic number.

It is an amenable number.

721444 is a deficient number, since it is larger than the sum of its proper divisors (541090).

721444 is a wasteful number, since it uses less digits than its factorization.

721444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180365 (or 180363 counting only the distinct ones).

The product of its digits is 896, while the sum is 22.

The square root of 721444 is about 849.3785963868. The cubic root of 721444 is about 89.6879729606.

The spelling of 721444 in words is "seven hundred twenty-one thousand, four hundred forty-four", and thus it is an iban number.