13871247 has 16 divisors (see below), whose sum is σ = 20039040. Its totient is φ = 8484192.

The previous prime is 13871233. The next prime is 13871279. The reversal of 13871247 is 74217831.

It is a happy number.

It is not a de Polignac number, because 13871247 - 2⁶ = 13871183 is a prime.

It is a super-2 number, since 2×13871247² = 384822986670018, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13871147) 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 15 ways as a sum of consecutive naturals, for example, 5988 + ... + 7974.

It is an arithmetic number, because the mean of its divisors is an integer number (1252440).

Almost surely, 2^13871247 is an apocalyptic number.

13871247 is a deficient number, since it is larger than the sum of its proper divisors (6167793).

13871247 is a wasteful number, since it uses less digits than its factorization.

13871247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2182.

The product of its digits is 9408, while the sum is 33.

The square root of 13871247 is about 3724.4123026325. The cubic root of 13871247 is about 240.2731092349.

The spelling of 13871247 in words is "thirteen million, eight hundred seventy-one thousand, two hundred forty-seven".