13890400686 has 24 divisors (see below), whose sum is σ = 31133657880. Its totient is φ = 4470473616.

The previous prime is 13890400669. The next prime is 13890400691. The reversal of 13890400686 is 68600409831.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13304460 + ... + 13305503.

It is an arithmetic number, because the mean of its divisors is an integer number (1297235745).

Almost surely, 2^13890400686 is an apocalyptic number.

13890400686 is an abundant number, since it is smaller than the sum of its proper divisors (17243257194).

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

13890400686 is a wasteful number, since it uses less digits than its factorization.

13890400686 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26610000 (or 26609997 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The spelling of 13890400686 in words is "thirteen billion, eight hundred ninety million, four hundred thousand, six hundred eighty-six".