13978611 has 12 divisors (see below), whose sum is σ = 20435688. Its totient is φ = 9206304.

The previous prime is 13978571. The next prime is 13978619. The reversal of 13978611 is 11687931.

13978611 is a `hidden beast` number, since 1 + 39 + 7 + 8 + 611 = 666.

It is not a de Polignac number, because 13978611 - 2⁹ = 13978099 is a prime.

It is not an unprimeable number, because it can be changed into a prime (13978619) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8610 + ... + 10103.

It is an arithmetic number, because the mean of its divisors is an integer number (1702974).

Almost surely, 2^13978611 is an apocalyptic number.

13978611 is a deficient number, since it is larger than the sum of its proper divisors (6457077).

13978611 is a wasteful number, since it uses less digits than its factorization.

13978611 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18802 (or 18799 counting only the distinct ones).

The product of its digits is 9072, while the sum is 36.

The square root of 13978611 is about 3738.7980688986. The cubic root of 13978611 is about 240.8914244939.

The spelling of 13978611 in words is "thirteen million, nine hundred seventy-eight thousand, six hundred eleven".