12749978 has 8 divisors (see below), whose sum is σ = 19641972. Its totient is φ = 6202656.

The previous prime is 12749953. The next prime is 12750011. The reversal of 12749978 is 87994721.

It can be written as a sum of positive squares in 2 ways, for example, as 12439729 + 310249 = 3527^2 + 557^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 86075 + ... + 86222.

Almost surely, 2^12749978 is an apocalyptic number.

12749978 is a deficient number, since it is larger than the sum of its proper divisors (6891994).

12749978 is a wasteful number, since it uses less digits than its factorization.

12749978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 172336.

The product of its digits is 254016, while the sum is 47.

The square root of 12749978 is about 3570.7111336539. The cubic root of 12749978 is about 233.6163020501.

It can be divided in two parts, 127 and 49978, that added together give a palindrome (50105).

The spelling of 12749978 in words is "twelve million, seven hundred forty-nine thousand, nine hundred seventy-eight".