13439999987 has 2 divisors, whose sum is σ = 13439999988. Its totient is φ = 13439999986.

The previous prime is 13439999983. The next prime is 13440000019. The reversal of 13439999987 is 78999993431.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 13439999987 - 2² = 13439999983 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 13439999987.

It is not a weakly prime, because it can be changed into another prime (13439999981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6719999993 + 6719999994.

It is an arithmetic number, because the mean of its divisors is an integer number (6719999994).

Almost surely, 2^13439999987 is an apocalyptic number.

13439999987 is a deficient number, since it is larger than the sum of its proper divisors (1).

13439999987 is an equidigital number, since it uses as much as digits as its factorization.

13439999987 is an evil number, because the sum of its binary digits is even.

The product of its digits is 119042784, while the sum is 71.

The spelling of 13439999987 in words is "thirteen billion, four hundred thirty-nine million, nine hundred ninety-nine thousand, nine hundred eighty-seven".