443399994 has 80 divisors (see below), whose sum is σ = 1025689896. Its totient is φ = 143078400.

The previous prime is 443399989. The next prime is 443400031. The reversal of 443399994 is 499993344.

It can be written as a sum of positive squares in 4 ways, for example, as 250050969 + 193349025 = 15813^2 + 13905^2 .

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 443399994.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 1600584 + ... + 1600860.

Almost surely, 2^443399994 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 443399994, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (512844948).

443399994 is an abundant number, since it is smaller than the sum of its proper divisors (582289902).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

443399994 is a wasteful number, since it uses less digits than its factorization.

443399994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 573 (or 564 counting only the distinct ones).

The product of its digits is 3779136, while the sum is 54.

The square root of 443399994 is about 21057.0651801242. The cubic root of 443399994 is about 762.5445608286.

The spelling of 443399994 in words is "four hundred forty-three million, three hundred ninety-nine thousand, nine hundred ninety-four".