13856840 has 16 divisors (see below), whose sum is σ = 31177980. Its totient is φ = 5542720.

The previous prime is 13856839. The next prime is 13856861. The reversal of 13856840 is 4865831.

It can be written as a sum of positive squares in 2 ways, for example, as 13147876 + 708964 = 3626^2 + 842^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 13856840.

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, 173171 + ... + 173250.

Almost surely, 2^13856840 is an apocalyptic number.

13856840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

13856840 is an abundant number, since it is smaller than the sum of its proper divisors (17321140).

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

13856840 is a wasteful number, since it uses less digits than its factorization.

13856840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 346432 (or 346428 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 35.

The square root of 13856840 is about 3722.4776695099. The cubic root of 13856840 is about 240.1898960046.

The spelling of 13856840 in words is "thirteen million, eight hundred fifty-six thousand, eight hundred forty".