13978943 has 16 divisors (see below), whose sum is σ = 15748992. Its totient is φ = 12300000.

The previous prime is 13978931. The next prime is 13978949. The reversal of 13978943 is 34987931.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 13978943 - 2¹⁶ = 13913407 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 13978894 and 13978903.

It is a congruent number.

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, 55568 + ... + 55818.

It is an arithmetic number, because the mean of its divisors is an integer number (984312).

Almost surely, 2^13978943 is an apocalyptic number.

13978943 is a deficient number, since it is larger than the sum of its proper divisors (1770049).

13978943 is a wasteful number, since it uses less digits than its factorization.

13978943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406.

The product of its digits is 163296, while the sum is 44.

The square root of 13978943 is about 3738.8424679304. The cubic root of 13978943 is about 240.8933315818.

The spelling of 13978943 in words is "thirteen million, nine hundred seventy-eight thousand, nine hundred forty-three".