12694738405 has 16 divisors (see below), whose sum is σ = 15430958784. Its totient is φ = 10024954240.

The previous prime is 12694738391. The next prime is 12694738411. The reversal of 12694738405 is 50483749621.

It is a happy number.

It is not a de Polignac number, because 12694738405 - 2⁹ = 12694737893 is a prime.

It is a super-2 number, since 2×12694738405² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 108114 + ... + 192556.

It is an arithmetic number, because the mean of its divisors is an integer number (964434924).

It is a 2-persistent number, because it is pandigital, and so is 2⋅12694738405 = 25389476810, but 3⋅12694738405 = 38084215215 is not.

Almost surely, 2^12694738405 is an apocalyptic number.

It is an amenable number.

12694738405 is a deficient number, since it is larger than the sum of its proper divisors (2736220379).

12694738405 is a wasteful number, since it uses less digits than its factorization.

12694738405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 84836.

The product of its (nonzero) digits is 1451520, while the sum is 49.

The spelling of 12694738405 in words is "twelve billion, six hundred ninety-four million, seven hundred thirty-eight thousand, four hundred five".