12793978 has 4 divisors (see below), whose sum is σ = 19190970. Its totient is φ = 6396988.

The previous prime is 12793969. The next prime is 12793981. The reversal of 12793978 is 87939721.

It is a happy number.

12793978 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 10870209 + 1923769 = 3297^2 + 1387^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3198493 + ... + 3198496.

Almost surely, 2^12793978 is an apocalyptic number.

12793978 is a deficient number, since it is larger than the sum of its proper divisors (6396992).

12793978 is an equidigital number, since it uses as much as digits as its factorization.

12793978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6396991.

The product of its digits is 190512, while the sum is 46.

The square root of 12793978 is about 3576.8670649047. The cubic root of 12793978 is about 233.8847290634.

The spelling of 12793978 in words is "twelve million, seven hundred ninety-three thousand, nine hundred seventy-eight".