39845621269 has 2 divisors, whose sum is σ = 39845621270. Its totient is φ = 39845621268.

The previous prime is 39845621209. The next prime is 39845621279. The reversal of 39845621269 is 96212654893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 37427932369 + 2417688900 = 193463^2 + 49170^2 .

It is an emirp because it is prime and its reverse (96212654893) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39845621269 - 2²⁹ = 39308750357 is a prime.

It is a super-2 number, since 2×39845621269² (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 (39845621209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19922810634 + 19922810635.

It is an arithmetic number, because the mean of its divisors is an integer number (19922810635).

Almost surely, 2^39845621269 is an apocalyptic number.

It is an amenable number.

39845621269 is a deficient number, since it is larger than the sum of its proper divisors (1).

39845621269 is an equidigital number, since it uses as much as digits as its factorization.

39845621269 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5598720, while the sum is 55.

The spelling of 39845621269 in words is "thirty-nine billion, eight hundred forty-five million, six hundred twenty-one thousand, two hundred sixty-nine".