12378147 has 4 divisors (see below), whose sum is σ = 16504200. Its totient is φ = 8252096.

The previous prime is 12378131. The next prime is 12378151. The reversal of 12378147 is 74187321.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 12378147 - 2⁴ = 12378131 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12378127) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2063022 + ... + 2063027.

It is an arithmetic number, because the mean of its divisors is an integer number (4126050).

Almost surely, 2^12378147 is an apocalyptic number.

12378147 is a deficient number, since it is larger than the sum of its proper divisors (4126053).

12378147 is an equidigital number, since it uses as much as digits as its factorization.

12378147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4126052.

The product of its digits is 9408, while the sum is 33.

The square root of 12378147 is about 3518.2590865370. The cubic root of 12378147 is about 231.3228558365.

The spelling of 12378147 in words is "twelve million, three hundred seventy-eight thousand, one hundred forty-seven".