721090443 has 4 divisors (see below), whose sum is σ = 961453928. Its totient is φ = 480726960.

The previous prime is 721090427. The next prime is 721090499. The reversal of 721090443 is 344090127.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 721090443 - 2⁴ = 721090427 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 721090443.

It is not an unprimeable number, because it can be changed into a prime (721091443) 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, 120181738 + ... + 120181743.

It is an arithmetic number, because the mean of its divisors is an integer number (240363482).

Almost surely, 2^721090443 is an apocalyptic number.

721090443 is a deficient number, since it is larger than the sum of its proper divisors (240363485).

721090443 is a wasteful number, since it uses less digits than its factorization.

721090443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 240363484.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 721090443 is about 26853.1272480506. The cubic root of 721090443 is about 896.7331948231.

The spelling of 721090443 in words is "seven hundred twenty-one million, ninety thousand, four hundred forty-three".