12447878 has 4 divisors (see below), whose sum is σ = 18671820. Its totient is φ = 6223938.

The previous prime is 12447871. The next prime is 12447881. The reversal of 12447878 is 87874421.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 87874421 = 23 ⋅3820627.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12447871) by changing a digit.

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 as a sum of consecutive naturals, namely, 3111968 + ... + 3111971.

It is an arithmetic number, because the mean of its divisors is an integer number (4667955).

Almost surely, 2^12447878 is an apocalyptic number.

12447878 is a deficient number, since it is larger than the sum of its proper divisors (6223942).

12447878 is an equidigital number, since it uses as much as digits as its factorization.

12447878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6223941.

The product of its digits is 100352, while the sum is 41.

The square root of 12447878 is about 3528.1550419447. The cubic root of 12447878 is about 231.7564204325.

The spelling of 12447878 in words is "twelve million, four hundred forty-seven thousand, eight hundred seventy-eight".