13931947 has 4 divisors (see below), whose sum is σ = 14025600. Its totient is φ = 13838296.

The previous prime is 13931933. The next prime is 13931987. The reversal of 13931947 is 74913931.

13931947 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74913931 = 29 ⋅2583239.

It is a cyclic number.

It is not a de Polignac number, because 13931947 - 2¹⁹ = 13407659 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13931987) 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 3 ways as a sum of consecutive naturals, for example, 46603 + ... + 46900.

It is an arithmetic number, because the mean of its divisors is an integer number (3506400).

Almost surely, 2^13931947 is an apocalyptic number.

13931947 is a deficient number, since it is larger than the sum of its proper divisors (93653).

13931947 is an equidigital number, since it uses as much as digits as its factorization.

13931947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 93652.

The product of its digits is 20412, while the sum is 37.

The square root of 13931947 is about 3732.5523439062. The cubic root of 13931947 is about 240.6230742973.

It can be divided in two parts, 13931 and 947, that added together give a triangular number (14878 = T₁₇₂).

The spelling of 13931947 in words is "thirteen million, nine hundred thirty-one thousand, nine hundred forty-seven".