444869991 has 12 divisors (see below), whose sum is σ = 680389632. Its totient is φ = 279134016.

The previous prime is 444869989. The next prime is 444870007. The reversal of 444869991 is 199968444.

It is a happy number.

It is not a de Polignac number, because 444869991 - 2¹ = 444869989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (444869291) 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, 1453671 + ... + 1453976.

It is an arithmetic number, because the mean of its divisors is an integer number (56699136).

Almost surely, 2^444869991 is an apocalyptic number.

444869991 is a deficient number, since it is larger than the sum of its proper divisors (235519641).

444869991 is a wasteful number, since it uses less digits than its factorization.

444869991 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2907670 (or 2907667 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 54.

The square root of 444869991 is about 21091.9413757956. The cubic root of 444869991 is about 763.3863152757.

The spelling of 444869991 in words is "four hundred forty-four million, eight hundred sixty-nine thousand, nine hundred ninety-one".