12135878 has 4 divisors (see below), whose sum is σ = 18203820. Its totient is φ = 6067938.

The previous prime is 12135859. The next prime is 12135899. The reversal of 12135878 is 87853121.

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

It is a congruent number.

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 as a sum of consecutive naturals, namely, 3033968 + ... + 3033971.

It is an arithmetic number, because the mean of its divisors is an integer number (4550955).

Almost surely, 2^12135878 is an apocalyptic number.

12135878 is a deficient number, since it is larger than the sum of its proper divisors (6067942).

12135878 is an equidigital number, since it uses as much as digits as its factorization.

12135878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6067941.

The product of its digits is 13440, while the sum is 35.

The square root of 12135878 is about 3483.6587088864. The cubic root of 12135878 is about 229.8037266953.

Adding to 12135878 its reverse (87853121), we get a palindrome (99988999).

The spelling of 12135878 in words is "twelve million, one hundred thirty-five thousand, eight hundred seventy-eight".