13871217 has 16 divisors (see below), whose sum is σ = 18937280. Its totient is φ = 9028800.

The previous prime is 13871183. The next prime is 13871233. The reversal of 13871217 is 71217831.

13871217 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13871217 - 2⁶ = 13871153 is a prime.

It is a super-2 number, since 2×13871217² = 384821322122178, which contains 22 as substring.

It is a Smith number, since the sum of its digits (30) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13871617) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 41742 + ... + 42072.

It is an arithmetic number, because the mean of its divisors is an integer number (1183580).

Almost surely, 2^13871217 is an apocalyptic number.

It is an amenable number.

13871217 is a deficient number, since it is larger than the sum of its proper divisors (5066063).

13871217 is a wasteful number, since it uses less digits than its factorization.

13871217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 624.

The product of its digits is 2352, while the sum is 30.

The square root of 13871217 is about 3724.4082751492. The cubic root of 13871217 is about 240.2729360182.

The spelling of 13871217 in words is "thirteen million, eight hundred seventy-one thousand, two hundred seventeen".