39944969 has 2 divisors, whose sum is σ = 39944970. Its totient is φ = 39944968.

The previous prime is 39944959. The next prime is 39944981. The reversal of 39944969 is 96944993.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 25603600 + 14341369 = 5060^2 + 3787^2 .

It is an emirp because it is prime and its reverse (96944993) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39944969 - 2²⁰ = 38896393 is a prime.

It is a super-2 number, since 2×39944969² = 3191201096821922, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 39944969.

It is not a weakly prime, because it can be changed into another prime (39944909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19972484 + 19972485.

It is an arithmetic number, because the mean of its divisors is an integer number (19972485).

Almost surely, 2^39944969 is an apocalyptic number.

It is an amenable number.

39944969 is a deficient number, since it is larger than the sum of its proper divisors (1).

39944969 is an equidigital number, since it uses as much as digits as its factorization.

39944969 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1889568, while the sum is 53.

The square root of 39944969 is about 6320.2032404030. The cubic root of 39944969 is about 341.8382812127.

The spelling of 39944969 in words is "thirty-nine million, nine hundred forty-four thousand, nine hundred sixty-nine".