444557213 has 4 divisors (see below), whose sum is σ = 449913408. Its totient is φ = 439201020.

The previous prime is 444557209. The next prime is 444557221. The reversal of 444557213 is 312755444.

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 444557213 - 2² = 444557209 is a prime.

It is a super-2 number, since 2×444557213² = 395262231260654738, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (444557273) 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, 2677973 + ... + 2678138.

It is an arithmetic number, because the mean of its divisors is an integer number (112478352).

Almost surely, 2^444557213 is an apocalyptic number.

It is an amenable number.

444557213 is a deficient number, since it is larger than the sum of its proper divisors (5356195).

444557213 is an equidigital number, since it uses as much as digits as its factorization.

444557213 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5356194.

The product of its digits is 67200, while the sum is 35.

The square root of 444557213 is about 21084.5254392884. The cubic root of 444557213 is about 763.2073667966.

The spelling of 444557213 in words is "four hundred forty-four million, five hundred fifty-seven thousand, two hundred thirteen".