12189878 has 8 divisors (see below), whose sum is σ = 18505368. Its totient is φ = 6021424.

The previous prime is 12189871. The next prime is 12189907. The reversal of 12189878 is 87898121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12189871) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36551 + ... + 36882.

It is an arithmetic number, because the mean of its divisors is an integer number (2313171).

Almost surely, 2^12189878 is an apocalyptic number.

12189878 is a deficient number, since it is larger than the sum of its proper divisors (6315490).

12189878 is an equidigital number, since it uses as much as digits as its factorization.

12189878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73518.

The product of its digits is 64512, while the sum is 44.

The square root of 12189878 is about 3491.4005785644. The cubic root of 12189878 is about 230.1440685290.

The spelling of 12189878 in words is "twelve million, one hundred eighty-nine thousand, eight hundred seventy-eight".