13879640 has 32 divisors (see below), whose sum is σ = 31823280. Its totient is φ = 5446272.

The previous prime is 13879637. The next prime is 13879651. The reversal of 13879640 is 4697831.

13879640 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 13879594 and 13879603.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1154 + ... + 5393.

Almost surely, 2^13879640 is an apocalyptic number.

13879640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13879640 is an abundant number, since it is smaller than the sum of its proper divisors (17943640).

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

13879640 is a wasteful number, since it uses less digits than its factorization.

13879640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6611 (or 6607 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 38.

The square root of 13879640 is about 3725.5388871947. The cubic root of 13879640 is about 240.3215597123.

The spelling of 13879640 in words is "thirteen million, eight hundred seventy-nine thousand, six hundred forty".