13691912840 has 16 divisors (see below), whose sum is σ = 30806803980. Its totient is φ = 5476765120.

The previous prime is 13691912837. The next prime is 13691912851. The reversal of 13691912840 is 4821919631.

It can be written as a sum of positive squares in 2 ways, for example, as 12728803684 + 963109156 = 112822^2 + 31034^2 .

It is a junction number, because it is equal to n+sod(n) for n = 13691912791 and 13691912800.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 171148871 + ... + 171148950.

Almost surely, 2^13691912840 is an apocalyptic number.

13691912840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13691912840 is an abundant number, since it is smaller than the sum of its proper divisors (17114891140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

13691912840 is a wasteful number, since it uses less digits than its factorization.

13691912840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 342297832 (or 342297828 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 44.

The spelling of 13691912840 in words is "thirteen billion, six hundred ninety-one million, nine hundred twelve thousand, eight hundred forty".