13978867 has 6 divisors (see below), whose sum is σ = 16261188. Its totient is φ = 11981844.

The previous prime is 13978849. The next prime is 13978897. The reversal of 13978867 is 76887931.

It is not a de Polignac number, because 13978867 - 2⁷ = 13978739 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (49), and also a Moran number because the ratio is a prime number: 285283 = 13978867 / (1 + 3 + 9 + 7 + 8 + 8 + 6 + 7).

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 13978867.

It is not an unprimeable number, because it can be changed into a prime (13978817) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 142593 + ... + 142690.

It is an arithmetic number, because the mean of its divisors is an integer number (2710198).

Almost surely, 2^13978867 is an apocalyptic number.

13978867 is a deficient number, since it is larger than the sum of its proper divisors (2282321).

13978867 is an equidigital number, since it uses as much as digits as its factorization.

13978867 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285297 (or 285290 counting only the distinct ones).

The product of its digits is 508032, while the sum is 49.

The square root of 13978867 is about 3738.8323043432. The cubic root of 13978867 is about 240.8928950222.

The spelling of 13978867 in words is "thirteen million, nine hundred seventy-eight thousand, eight hundred sixty-seven".