13439999991 has 32 divisors (see below), whose sum is σ = 20089900800. Its totient is φ = 7920391680.

The previous prime is 13439999987. The next prime is 13440000019. The reversal of 13439999991 is 19999993431.

It is not a de Polignac number, because 13439999991 - 2² = 13439999987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13439999921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3183480 + ... + 3187698.

It is an arithmetic number, because the mean of its divisors is an integer number (627809400).

Almost surely, 2^13439999991 is an apocalyptic number.

13439999991 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

13439999991 is a deficient number, since it is larger than the sum of its proper divisors (6649900809).

13439999991 is a wasteful number, since it uses less digits than its factorization.

13439999991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6879.

The product of its digits is 19131876, while the sum is 66.

The spelling of 13439999991 in words is "thirteen billion, four hundred thirty-nine million, nine hundred ninety-nine thousand, nine hundred ninety-one".