12307978 has 8 divisors (see below), whose sum is σ = 18810468. Its totient is φ = 6037824.

The previous prime is 12307957. The next prime is 12307993. The reversal of 12307978 is 87970321.

It can be written as a sum of positive squares in 2 ways, for example, as 12201049 + 106929 = 3493^2 + 327^2 .

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, 57951 + ... + 58162.

Almost surely, 2^12307978 is an apocalyptic number.

12307978 is a deficient number, since it is larger than the sum of its proper divisors (6502490).

12307978 is a wasteful number, since it uses less digits than its factorization.

12307978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 116168.

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

The square root of 12307978 is about 3508.2727944104. The cubic root of 12307978 is about 230.8849210973.

The spelling of 12307978 in words is "twelve million, three hundred seven thousand, nine hundred seventy-eight".