13906240 has 28 divisors (see below), whose sum is σ = 33114996. Its totient is φ = 5562368.

The previous prime is 13906183. The next prime is 13906261. The reversal of 13906240 is 4260931.

It can be written as a sum of positive squares in 2 ways, for example, as 6594624 + 7311616 = 2568^2 + 2704^2 .

It is a congruent number.

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, 21409 + ... + 22048.

Almost surely, 2^13906240 is an apocalyptic number.

13906240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13906240 is an abundant number, since it is smaller than the sum of its proper divisors (19208756).

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

13906240 is an equidigital number, since it uses as much as digits as its factorization.

13906240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43474 (or 43464 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 25.

The square root of 13906240 is about 3729.1071317408. The cubic root of 13906240 is about 240.4749852600.

The spelling of 13906240 in words is "thirteen million, nine hundred six thousand, two hundred forty".