445721 has 4 divisors (see below), whose sum is σ = 469200. Its totient is φ = 422244.

The previous prime is 445703. The next prime is 445741. The reversal of 445721 is 127544.

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.

It is a cyclic number.

It is not a de Polignac number, because 445721 - 2⁶ = 445657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (445741) 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, 11711 + ... + 11748.

It is an arithmetic number, because the mean of its divisors is an integer number (117300).

2⁴⁴⁵⁷²¹ is an apocalyptic number.

It is an amenable number.

445721 is a deficient number, since it is larger than the sum of its proper divisors (23479).

445721 is a wasteful number, since it uses less digits than its factorization.

445721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23478.

The product of its digits is 1120, while the sum is 23.

The square root of 445721 is about 667.6233968339. The cubic root of 445721 is about 76.3872775614.

The spelling of 445721 in words is "four hundred forty-five thousand, seven hundred twenty-one".