13806840 has 32 divisors (see below), whose sum is σ = 41420880. Its totient is φ = 3681792.

The previous prime is 13806833. The next prime is 13806851. The reversal of 13806840 is 4860831.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 13806798 and 13806807.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 57409 + ... + 57648.

Almost surely, 2^13806840 is an apocalyptic number.

13806840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13806840 is an abundant number, since it is smaller than the sum of its proper divisors (27614040).

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

13806840 is a wasteful number, since it uses less digits than its factorization.

13806840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115071 (or 115067 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 13806840 is about 3715.7556432037. The cubic root of 13806840 is about 239.9006533261.

The spelling of 13806840 in words is "thirteen million, eight hundred six thousand, eight hundred forty".