387847439989 has 2 divisors, whose sum is σ = 387847439990. Its totient is φ = 387847439988.

The previous prime is 387847439953. The next prime is 387847440061. The reversal of 387847439989 is 989934748783.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 340577288100 + 47270151889 = 583590^2 + 217417^2 .

It is a cyclic number.

It is not a de Polignac number, because 387847439989 - 2¹⁵ = 387847407221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (387847439389) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 193923719994 + 193923719995.

It is an arithmetic number, because the mean of its divisors is an integer number (193923719995).

Almost surely, 2^387847439989 is an apocalyptic number.

It is an amenable number.

387847439989 is a deficient number, since it is larger than the sum of its proper divisors (1).

387847439989 is an equidigital number, since it uses as much as digits as its factorization.

387847439989 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2633637888, while the sum is 79.

The spelling of 387847439989 in words is "three hundred eighty-seven billion, eight hundred forty-seven million, four hundred thirty-nine thousand, nine hundred eighty-nine".