11978943 has 16 divisors (see below), whose sum is σ = 16646880. Its totient is φ = 7652736.

The previous prime is 11978921. The next prime is 11978959. The reversal of 11978943 is 34987911.

It is a happy number.

It is not a de Polignac number, because 11978943 - 2¹⁸ = 11716799 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 11978895 and 11978904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (11978443) 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, 13221 + ... + 14097.

It is an arithmetic number, because the mean of its divisors is an integer number (1040430).

Almost surely, 2^11978943 is an apocalyptic number.

11978943 is a deficient number, since it is larger than the sum of its proper divisors (4667937).

11978943 is a wasteful number, since it uses less digits than its factorization.

11978943 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1066.

The product of its digits is 54432, while the sum is 42.

The square root of 11978943 is about 3461.0609645021. The cubic root of 11978943 is about 228.8088576188.

It can be divided in two parts, 11978 and 943, that added together give a palindrome (12921).

The spelling of 11978943 in words is "eleven million, nine hundred seventy-eight thousand, nine hundred forty-three".