445783989 has 16 divisors (see below), whose sum is σ = 679976960. Its totient is φ = 254476080.

The previous prime is 445783883. The next prime is 445783993. The reversal of 445783989 is 989387544.

It is a de Polignac number, because none of the positive numbers 2^k-445783989 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (445783189) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11604 + ... + 32034.

It is an arithmetic number, because the mean of its divisors is an integer number (42498560).

Almost surely, 2^445783989 is an apocalyptic number.

It is an amenable number.

445783989 is a deficient number, since it is larger than the sum of its proper divisors (234192971).

445783989 is a wasteful number, since it uses less digits than its factorization.

445783989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21480.

The product of its digits is 8709120, while the sum is 57.

The square root of 445783989 is about 21113.5972539025. The cubic root of 445783989 is about 763.9087572522.

The spelling of 445783989 in words is "four hundred forty-five million, seven hundred eighty-three thousand, nine hundred eighty-nine".