13971249 has 12 divisors (see below), whose sum is σ = 20219316. Its totient is φ = 9296352.

The previous prime is 13971247. The next prime is 13971253. The reversal of 13971249 is 94217931.

It can be written as a sum of positive squares in 2 ways, for example, as 10284849 + 3686400 = 3207^2 + 1920^2 .

It is not a de Polignac number, because 13971249 - 2¹ = 13971247 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13971247) 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 11 ways as a sum of consecutive naturals, for example, 4947 + ... + 7239.

It is an arithmetic number, because the mean of its divisors is an integer number (1684943).

Almost surely, 2^13971249 is an apocalyptic number.

It is an amenable number.

13971249 is a deficient number, since it is larger than the sum of its proper divisors (6248067).

13971249 is a wasteful number, since it uses less digits than its factorization.

13971249 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2976 (or 2973 counting only the distinct ones).

The product of its digits is 13608, while the sum is 36.

The square root of 13971249 is about 3737.8133982316. The cubic root of 13971249 is about 240.8491276331.

It can be divided in two parts, 1397124 and 9, that multiplied together give a square (12574116 = 3546²).

The spelling of 13971249 in words is "thirteen million, nine hundred seventy-one thousand, two hundred forty-nine".