13978947 has 16 divisors (see below), whose sum is σ = 20034432. Its totient is φ = 8638080.

The previous prime is 13978931. The next prime is 13978949. The reversal of 13978947 is 74987931.

13978947 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 13978947 - 2⁴ = 13978931 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 13978896 and 13978905.

It is not an unprimeable number, because it can be changed into a prime (13978949) 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, 1372 + ... + 5462.

It is an arithmetic number, because the mean of its divisors is an integer number (1252152).

Almost surely, 2^13978947 is an apocalyptic number.

13978947 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

13978947 is a deficient number, since it is larger than the sum of its proper divisors (6055485).

13978947 is a wasteful number, since it uses less digits than its factorization.

13978947 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4178.

The product of its digits is 381024, while the sum is 48.

The square root of 13978947 is about 3738.8430028553. The cubic root of 13978947 is about 240.8933545586.

The spelling of 13978947 in words is "thirteen million, nine hundred seventy-eight thousand, nine hundred forty-seven".