13440312391 has 16 divisors (see below), whose sum is σ = 14759395488. Its totient is φ = 12137558400.

The previous prime is 13440312373. The next prime is 13440312439. The reversal of 13440312391 is 19321304431.

It is not a de Polignac number, because 13440312391 - 2²¹ = 13438215239 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13440312331) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3082585 + ... + 3086941.

It is an arithmetic number, because the mean of its divisors is an integer number (922462218).

Almost surely, 2^13440312391 is an apocalyptic number.

13440312391 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

13440312391 is a deficient number, since it is larger than the sum of its proper divisors (1319083097).

13440312391 is a wasteful number, since it uses less digits than its factorization.

13440312391 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6162.

The product of its (nonzero) digits is 7776, while the sum is 31.

The spelling of 13440312391 in words is "thirteen billion, four hundred forty million, three hundred twelve thousand, three hundred ninety-one".