13978907 has 4 divisors (see below), whose sum is σ = 14028936. Its totient is φ = 13928880.

The previous prime is 13978901. The next prime is 13978931. The reversal of 13978907 is 70987931.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 70987931 = 7 ⋅10141133.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-13978907 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (13978901) 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, 24593 + ... + 25154.

It is an arithmetic number, because the mean of its divisors is an integer number (3507234).

Almost surely, 2^13978907 is an apocalyptic number.

13978907 is a deficient number, since it is larger than the sum of its proper divisors (50029).

13978907 is an equidigital number, since it uses as much as digits as its factorization.

13978907 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50028.

The product of its (nonzero) digits is 95256, while the sum is 44.

The square root of 13978907 is about 3738.8376536031. The cubic root of 13978907 is about 240.8931247906.

The spelling of 13978907 in words is "thirteen million, nine hundred seventy-eight thousand, nine hundred seven".