12309778 has 8 divisors (see below), whose sum is σ = 19885068. Its totient is φ = 5681424.

The previous prime is 12309769. The next prime is 12309797. The reversal of 12309778 is 87790321.

It can be written as a sum of positive squares in 2 ways, for example, as 10284849 + 2024929 = 3207^2 + 1423^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 236701 + ... + 236752.

Almost surely, 2^12309778 is an apocalyptic number.

12309778 is a deficient number, since it is larger than the sum of its proper divisors (7575290).

12309778 is a wasteful number, since it uses less digits than its factorization.

12309778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 473468.

The product of its (nonzero) digits is 21168, while the sum is 37.

The square root of 12309778 is about 3508.5293215249. The cubic root of 12309778 is about 230.8961759273.

The spelling of 12309778 in words is "twelve million, three hundred nine thousand, seven hundred seventy-eight".