39949887398413 has 2 divisors, whose sum is σ = 39949887398414. Its totient is φ = 39949887398412.

The previous prime is 39949887398339. The next prime is 39949887398419. The reversal of 39949887398413 is 31489378894993.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 34393509701604 + 5556377696809 = 5864598^2 + 2357197^2 .

It is a cyclic number.

It is not a de Polignac number, because 39949887398413 - 2¹³ = 39949887390221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39949887398419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19974943699206 + 19974943699207.

It is an arithmetic number, because the mean of its divisors is an integer number (19974943699207).

Almost surely, 2^{39949887398413} is an apocalyptic number.

It is an amenable number.

39949887398413 is a deficient number, since it is larger than the sum of its proper divisors (1).

39949887398413 is an equidigital number, since it uses as much as digits as its factorization.

39949887398413 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10158317568, while the sum is 85.

The spelling of 39949887398413 in words is "thirty-nine trillion, nine hundred forty-nine billion, eight hundred eighty-seven million, three hundred ninety-eight thousand, four hundred thirteen".