721443 has 8 divisors (see below), whose sum is σ = 971856. Its totient is φ = 476000.

The previous prime is 721439. The next prime is 721451. The reversal of 721443 is 344127.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 721443 - 2² = 721439 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 721443.

It is not an unprimeable number, because it can be changed into a prime (721043) by changing a digit.

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, 888 + ... + 1493.

It is an arithmetic number, because the mean of its divisors is an integer number (121482).

2⁷²¹⁴⁴³ is an apocalyptic number.

721443 is a deficient number, since it is larger than the sum of its proper divisors (250413).

721443 is a wasteful number, since it uses less digits than its factorization.

721443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2485.

The product of its digits is 672, while the sum is 21.

The square root of 721443 is about 849.3780077209. The cubic root of 721443 is about 89.6879315215.

The spelling of 721443 in words is "seven hundred twenty-one thousand, four hundred forty-three", and thus it is an iban number.