13978671 has 12 divisors (see below), whose sum is σ = 21681432. Its totient is φ = 7987728.

The previous prime is 13978669. The next prime is 13978673. The reversal of 13978671 is 17687931.

It is an interprime number because it is at equal distance from previous prime (13978669) and next prime (13978673).

It is not a de Polignac number, because 13978671 - 2¹ = 13978669 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13978673) 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, 47400 + ... + 47693.

It is an arithmetic number, because the mean of its divisors is an integer number (1806786).

Almost surely, 2^13978671 is an apocalyptic number.

13978671 is a deficient number, since it is larger than the sum of its proper divisors (7702761).

13978671 is an equidigital number, since it uses as much as digits as its factorization.

13978671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95110 (or 95103 counting only the distinct ones).

The product of its digits is 63504, while the sum is 42.

The square root of 13978671 is about 3738.8060928591. The cubic root of 13978671 is about 240.8917691506.

The spelling of 13978671 in words is "thirteen million, nine hundred seventy-eight thousand, six hundred seventy-one".