39788047823921 has 2 divisors, whose sum is σ = 39788047823922. Its totient is φ = 39788047823920.

The previous prime is 39788047823899. The next prime is 39788047824013. The reversal of 39788047823921 is 12932874088793.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 28924174734400 + 10863873089521 = 5378120^2 + 3296039^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-39788047823921 is a prime.

It is not a weakly prime, because it can be changed into another prime (39788047823521) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19894023911960 + 19894023911961.

It is an arithmetic number, because the mean of its divisors is an integer number (19894023911961).

Almost surely, 2^{39788047823921} is an apocalyptic number.

It is an amenable number.

39788047823921 is a deficient number, since it is larger than the sum of its proper divisors (1).

39788047823921 is an equidigital number, since it uses as much as digits as its factorization.

39788047823921 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 292626432, while the sum is 71.

The spelling of 39788047823921 in words is "thirty-nine trillion, seven hundred eighty-eight billion, forty-seven million, eight hundred twenty-three thousand, nine hundred twenty-one".