440239109 has 2 divisors, whose sum is σ = 440239110. Its totient is φ = 440239108.

The previous prime is 440239097. The next prime is 440239127. The reversal of 440239109 is 901932044.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 311416609 + 128822500 = 17647^2 + 11350^2 .

It is a cyclic number.

It is not a de Polignac number, because 440239109 - 2²⁰ = 439190533 is a prime.

It is a super-2 number, since 2×440239109² = 387620946186227762, which contains 22 as substring.

It is a Sophie Germain 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 (440239309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 220119554 + 220119555.

It is an arithmetic number, because the mean of its divisors is an integer number (220119555).

Almost surely, 2^440239109 is an apocalyptic number.

It is an amenable number.

440239109 is a deficient number, since it is larger than the sum of its proper divisors (1).

440239109 is an equidigital number, since it uses as much as digits as its factorization.

440239109 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7776, while the sum is 32.

The square root of 440239109 is about 20981.8757264454. The cubic root of 440239109 is about 760.7282429845.

The spelling of 440239109 in words is "four hundred forty million, two hundred thirty-nine thousand, one hundred nine".