13708979390405 has 24 divisors (see below), whose sum is σ = 17971203646728. Its totient is φ = 10033964967936.

The previous prime is 13708979390399. The next prime is 13708979390413. The reversal of 13708979390405 is 50409397980731.

It can be written as a sum of positive squares in 12 ways, for example, as 11812260988609 + 1896718401796 = 3436897^2 + 1377214^2 .

It is not a de Polignac number, because 13708979390405 - 2²⁸ = 13708710954949 is a prime.

It is a super-2 number, since 2×13708979390405² (a number of 27 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (65).

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 71690552 + ... + 71881521.

It is an arithmetic number, because the mean of its divisors is an integer number (748800151947).

Almost surely, 2^{13708979390405} is an apocalyptic number.

It is an amenable number.

13708979390405 is a deficient number, since it is larger than the sum of its proper divisors (4262224256323).

13708979390405 is a wasteful number, since it uses less digits than its factorization.

13708979390405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143572217 (or 143572204 counting only the distinct ones).

The product of its (nonzero) digits is 51438240, while the sum is 65.

The spelling of 13708979390405 in words is "thirteen trillion, seven hundred eight billion, nine hundred seventy-nine million, three hundred ninety thousand, four hundred five".