12187397889 has 16 divisors (see below), whose sum is σ = 18057219840. Its totient is φ = 8124114960.

The previous prime is 12187397881. The next prime is 12187397891. The reversal of 12187397889 is 98879378121.

It is not a de Polignac number, because 12187397889 - 2³ = 12187397881 is a prime.

It is not an unprimeable number, because it can be changed into a prime (12187397881) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 382024 + ... + 412694.

It is an arithmetic number, because the mean of its divisors is an integer number (1128576240).

Almost surely, 2^12187397889 is an apocalyptic number.

It is an amenable number.

12187397889 is a deficient number, since it is larger than the sum of its proper divisors (5869821951).

12187397889 is a wasteful number, since it uses less digits than its factorization.

12187397889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45397 (or 45391 counting only the distinct ones).

The product of its digits is 12192768, while the sum is 63.

The spelling of 12187397889 in words is "twelve billion, one hundred eighty-seven million, three hundred ninety-seven thousand, eight hundred eighty-nine".