39444237109 has 2 divisors, whose sum is σ = 39444237110. Its totient is φ = 39444237108.

The previous prime is 39444237073. The next prime is 39444237121. The reversal of 39444237109 is 90173244493.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 30748674609 + 8695562500 = 175353^2 + 93250^2 .

It is a cyclic number.

It is not a de Polignac number, because 39444237109 - 2²⁷ = 39310019381 is a prime.

It is a super-2 number, since 2×39444237109² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39444237169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19722118554 + 19722118555.

It is an arithmetic number, because the mean of its divisors is an integer number (19722118555).

Almost surely, 2^39444237109 is an apocalyptic number.

It is an amenable number.

39444237109 is a deficient number, since it is larger than the sum of its proper divisors (1).

39444237109 is an equidigital number, since it uses as much as digits as its factorization.

39444237109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 653184, while the sum is 46.

The spelling of 39444237109 in words is "thirty-nine billion, four hundred forty-four million, two hundred thirty-seven thousand, one hundred nine".