12891737238 has 32 divisors (see below), whose sum is σ = 26031770496. Its totient is φ = 4256060928.

The previous prime is 12891737237. The next prime is 12891737269. The reversal of 12891737238 is 83273719821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12891737231) 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, 238345 + ... + 287387.

It is an arithmetic number, because the mean of its divisors is an integer number (813492828).

Almost surely, 2^12891737238 is an apocalyptic number.

12891737238 is an abundant number, since it is smaller than the sum of its proper divisors (13140033258).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

12891737238 is a wasteful number, since it uses less digits than its factorization.

12891737238 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49468.

The product of its digits is 1016064, while the sum is 51.

The spelling of 12891737238 in words is "twelve billion, eight hundred ninety-one million, seven hundred thirty-seven thousand, two hundred thirty-eight".