13929871 has 4 divisors (see below), whose sum is σ = 14306392. Its totient is φ = 13553352.

The previous prime is 13929863. The next prime is 13929887. The reversal of 13929871 is 17892931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 17892931 = 7 ⋅2556133.

It is a cyclic number.

It is not a de Polignac number, because 13929871 - 2³ = 13929863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13929271) 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, 188205 + ... + 188278.

It is an arithmetic number, because the mean of its divisors is an integer number (3576598).

Almost surely, 2^13929871 is an apocalyptic number.

13929871 is a deficient number, since it is larger than the sum of its proper divisors (376521).

13929871 is an equidigital number, since it uses as much as digits as its factorization.

13929871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376520.

The product of its digits is 27216, while the sum is 40.

The square root of 13929871 is about 3732.2742396560. The cubic root of 13929871 is about 240.6111219522.

The spelling of 13929871 in words is "thirteen million, nine hundred twenty-nine thousand, eight hundred seventy-one".