126378009 has 8 divisors (see below), whose sum is σ = 187226720. Its totient is φ = 84251988.

The previous prime is 126377981. The next prime is 126378011. The reversal of 126378009 is 900873621.

126378009 is a `hidden beast` number, since 12 + 637 + 8 + 0 + 0 + 9 = 666.

It is not a de Polignac number, because 126378009 - 2⁸ = 126377753 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126378019) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2340307 + ... + 2340360.

It is an arithmetic number, because the mean of its divisors is an integer number (23403340).

Almost surely, 2^126378009 is an apocalyptic number.

It is an amenable number.

126378009 is a deficient number, since it is larger than the sum of its proper divisors (60848711).

126378009 is an equidigital number, since it uses as much as digits as its factorization.

126378009 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4680676 (or 4680670 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 126378009 is about 11241.7974096672. The cubic root of 126378009 is about 501.8306347067.

The spelling of 126378009 in words is "one hundred twenty-six million, three hundred seventy-eight thousand, nine".