39456443381 has 2 divisors, whose sum is σ = 39456443382. Its totient is φ = 39456443380.

The previous prime is 39456443363. The next prime is 39456443449. The reversal of 39456443381 is 18334465493.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 31618174225 + 7838269156 = 177815^2 + 88534^2 .

It is an emirp because it is prime and its reverse (18334465493) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39456443381 is a prime.

It is a super-2 number, since 2×39456443381² (a number of 22 digits) 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 (39456443311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19728221690 + 19728221691.

It is an arithmetic number, because the mean of its divisors is an integer number (19728221691).

Almost surely, 2^39456443381 is an apocalyptic number.

It is an amenable number.

39456443381 is a deficient number, since it is larger than the sum of its proper divisors (1).

39456443381 is an equidigital number, since it uses as much as digits as its factorization.

39456443381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3732480, while the sum is 50.

The spelling of 39456443381 in words is "thirty-nine billion, four hundred fifty-six million, four hundred forty-three thousand, three hundred eighty-one".