444872009 has 2 divisors, whose sum is σ = 444872010. Its totient is φ = 444872008.

The previous prime is 444871969. The next prime is 444872033. The reversal of 444872009 is 900278444.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 301543225 + 143328784 = 17365^2 + 11972^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-444872009 is a prime.

It is a super-2 number, since 2×444872009² = 395822208783392162, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (444872039) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 222436004 + 222436005.

It is an arithmetic number, because the mean of its divisors is an integer number (222436005).

Almost surely, 2^444872009 is an apocalyptic number.

It is an amenable number.

444872009 is a deficient number, since it is larger than the sum of its proper divisors (1).

444872009 is an equidigital number, since it uses as much as digits as its factorization.

444872009 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 64512, while the sum is 38.

The square root of 444872009 is about 21091.9892139172. The cubic root of 444872009 is about 763.3874695539.

The spelling of 444872009 in words is "four hundred forty-four million, eight hundred seventy-two thousand, nine".