13891947 has 8 divisors (see below), whose sum is σ = 18619344. Its totient is φ = 9212928.

The previous prime is 13891903. The next prime is 13891949. The reversal of 13891947 is 74919831.

It is a happy number.

13891947 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 13891947 - 2⁷ = 13891819 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 13891899 and 13891908.

It is not an unprimeable number, because it can be changed into a prime (13891949) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11418 + ... + 12575.

It is an arithmetic number, because the mean of its divisors is an integer number (2327418).

Almost surely, 2^13891947 is an apocalyptic number.

13891947 is a deficient number, since it is larger than the sum of its proper divisors (4727397).

13891947 is a wasteful number, since it uses less digits than its factorization.

13891947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24189.

The product of its digits is 54432, while the sum is 42.

The square root of 13891947 is about 3727.1902285770. The cubic root of 13891947 is about 240.3925693276.

The spelling of 13891947 in words is "thirteen million, eight hundred ninety-one thousand, nine hundred forty-seven".