39623886389 has 2 divisors, whose sum is σ = 39623886390. Its totient is φ = 39623886388.

The previous prime is 39623886371. The next prime is 39623886437. The reversal of 39623886389 is 98368832693.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 26299108900 + 13324777489 = 162170^2 + 115433^2 .

It is an emirp because it is prime and its reverse (98368832693) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 39623886389 - 2²⁸ = 39355450933 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (39623886329) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19811943194 + 19811943195.

It is an arithmetic number, because the mean of its divisors is an integer number (19811943195).

Almost surely, 2^39623886389 is an apocalyptic number.

It is an amenable number.

39623886389 is a deficient number, since it is larger than the sum of its proper divisors (1).

39623886389 is an equidigital number, since it uses as much as digits as its factorization.

39623886389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 80621568, while the sum is 65.

The spelling of 39623886389 in words is "thirty-nine billion, six hundred twenty-three million, eight hundred eighty-six thousand, three hundred eighty-nine".