443628989 has 2 divisors, whose sum is σ = 443628990. Its totient is φ = 443628988.

The previous prime is 443628961. The next prime is 443629007. The reversal of 443628989 is 989826344.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 305096089 + 138532900 = 17467^2 + 11770^2 .

It is a cyclic number.

It is not a de Polignac number, because 443628989 - 2¹⁶ = 443563453 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 443628989.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (443628919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221814494 + 221814495.

It is an arithmetic number, because the mean of its divisors is an integer number (221814495).

Almost surely, 2^443628989 is an apocalyptic number.

It is an amenable number.

443628989 is a deficient number, since it is larger than the sum of its proper divisors (1).

443628989 is an equidigital number, since it uses as much as digits as its factorization.

443628989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2985984, while the sum is 53.

The square root of 443628989 is about 21062.5019643916. The cubic root of 443628989 is about 762.6758108977.

The spelling of 443628989 in words is "four hundred forty-three million, six hundred twenty-eight thousand, nine hundred eighty-nine".