443420389 has 2 divisors, whose sum is σ = 443420390. Its totient is φ = 443420388.

The previous prime is 443420363. The next prime is 443420399. The reversal of 443420389 is 983024344.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 255456289 + 187964100 = 15983^2 + 13710^2 .

It is a cyclic number.

It is not a de Polignac number, because 443420389 - 2⁷ = 443420261 is a prime.

It is a super-2 number, since 2×443420389² = 393243282761822642, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (443420399) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221710194 + 221710195.

It is an arithmetic number, because the mean of its divisors is an integer number (221710195).

Almost surely, 2^443420389 is an apocalyptic number.

It is an amenable number.

443420389 is a deficient number, since it is larger than the sum of its proper divisors (1).

443420389 is an equidigital number, since it uses as much as digits as its factorization.

443420389 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 82944, while the sum is 37.

The square root of 443420389 is about 21057.5494538182. The cubic root of 443420389 is about 762.5562521968.

The spelling of 443420389 in words is "four hundred forty-three million, four hundred twenty thousand, three hundred eighty-nine".