12187232978 has 16 divisors (see below), whose sum is σ = 18573922080. Its totient is φ = 5996575200.

The previous prime is 12187232971. The next prime is 12187232983. The reversal of 12187232978 is 87923278121.

It is a super-3 number, since 3×12187232978³ (a number of 31 digits) contains 333 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12187232971) 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, 124688 + ... + 199803.

It is an arithmetic number, because the mean of its divisors is an integer number (1160870130).

Almost surely, 2^12187232978 is an apocalyptic number.

12187232978 is a deficient number, since it is larger than the sum of its proper divisors (6386689102).

12187232978 is a wasteful number, since it uses less digits than its factorization.

12187232978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324793.

The product of its digits is 677376, while the sum is 50.

The spelling of 12187232978 in words is "twelve billion, one hundred eighty-seven million, two hundred thirty-two thousand, nine hundred seventy-eight".