13391856 has 60 divisors (see below), whose sum is σ = 37856208. Its totient is φ = 4419072.

The previous prime is 13391839. The next prime is 13391857. The reversal of 13391856 is 65819331.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 13391856.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13391857) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 15861 + ... + 16683.

Almost surely, 2^13391856 is an apocalyptic number.

13391856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13391856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18928104).

13391856 is an abundant number, since it is smaller than the sum of its proper divisors (24464352).

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

13391856 is a wasteful number, since it uses less digits than its factorization.

13391856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 950 (or 941 counting only the distinct ones).

The product of its digits is 19440, while the sum is 36.

The square root of 13391856 is about 3659.4884888465. The cubic root of 13391856 is about 237.4726454183.

The spelling of 13391856 in words is "thirteen million, three hundred ninety-one thousand, eight hundred fifty-six".