444375891 has 12 divisors (see below), whose sum is σ = 644757568. Its totient is φ = 294920784.

The previous prime is 444375851. The next prime is 444375901. The reversal of 444375891 is 198573444.

It is not a de Polignac number, because 444375891 - 2²⁶ = 377267027 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (444375821) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 108700 + ... + 112713.

Almost surely, 2^444375891 is an apocalyptic number.

444375891 is a deficient number, since it is larger than the sum of its proper divisors (200381677).

444375891 is a wasteful number, since it uses less digits than its factorization.

444375891 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221642 (or 221639 counting only the distinct ones).

The product of its digits is 483840, while the sum is 45.

The square root of 444375891 is about 21080.2251173938. The cubic root of 444375891 is about 763.1035892992.

The spelling of 444375891 in words is "four hundred forty-four million, three hundred seventy-five thousand, eight hundred ninety-one".