12339978 has 32 divisors (see below), whose sum is σ = 28494720. Its totient is φ = 3489600.

The previous prime is 12339967. The next prime is 12339979. The reversal of 12339978 is 87993321.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (12339979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2788 + ... + 5696.

It is an arithmetic number, because the mean of its divisors is an integer number (890460).

Almost surely, 2^12339978 is an apocalyptic number.

12339978 is an abundant number, since it is smaller than the sum of its proper divisors (16154742).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12339978 is a wasteful number, since it uses less digits than its factorization.

12339978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3022.

The product of its digits is 81648, while the sum is 42.

The square root of 12339978 is about 3512.8304826735. The cubic root of 12339978 is about 231.0848435554.

It can be divided in two parts, 1233 and 9978, that added together give a palindrome (11211).

The spelling of 12339978 in words is "twelve million, three hundred thirty-nine thousand, nine hundred seventy-eight".