443494721 has 2 divisors, whose sum is σ = 443494722. Its totient is φ = 443494720.

The previous prime is 443494687. The next prime is 443494739. The reversal of 443494721 is 127494344.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 285238321 + 158256400 = 16889^2 + 12580^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-443494721 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (443494741) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 221747360 + 221747361.

It is an arithmetic number, because the mean of its divisors is an integer number (221747361).

Almost surely, 2^443494721 is an apocalyptic number.

It is an amenable number.

443494721 is a deficient number, since it is larger than the sum of its proper divisors (1).

443494721 is an equidigital number, since it uses as much as digits as its factorization.

443494721 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 38.

The square root of 443494721 is about 21059.3143525614. The cubic root of 443494721 is about 762.5988597432.

The spelling of 443494721 in words is "four hundred forty-three million, four hundred ninety-four thousand, seven hundred twenty-one".