444437309 has 2 divisors, whose sum is σ = 444437310. Its totient is φ = 444437308.

The previous prime is 444437261. The next prime is 444437317. The reversal of 444437309 is 903734444.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 418325209 + 26112100 = 20453^2 + 5110^2 .

It is a cyclic number.

It is not a de Polignac number, because 444437309 - 2⁸ = 444437053 is a prime.

It is a super-2 number, since 2×444437309² = 395049043262322962, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (444437339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 222218654 + 222218655.

It is an arithmetic number, because the mean of its divisors is an integer number (222218655).

Almost surely, 2^444437309 is an apocalyptic number.

It is an amenable number.

444437309 is a deficient number, since it is larger than the sum of its proper divisors (1).

444437309 is an equidigital number, since it uses as much as digits as its factorization.

444437309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 145152, while the sum is 38.

The square root of 444437309 is about 21081.6818351857. The cubic root of 444437309 is about 763.1387443246.

The spelling of 444437309 in words is "four hundred forty-four million, four hundred thirty-seven thousand, three hundred nine".