12977731386 has 96 divisors (see below), whose sum is σ = 30918451200. Its totient is φ = 4068344880.

The previous prime is 12977731381. The next prime is 12977731397. The reversal of 12977731386 is 68313777921.

12977731386 is a `hidden beast` number, since 129 + 77 + 73 + 1 + 386 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12977731381) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1278471 + ... + 1288581.

It is an arithmetic number, because the mean of its divisors is an integer number (322067200).

Almost surely, 2^12977731386 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12977731386, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15459225600).

12977731386 is an abundant number, since it is smaller than the sum of its proper divisors (17940719814).

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

12977731386 is a wasteful number, since it uses less digits than its factorization.

12977731386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10286 (or 10274 counting only the distinct ones).

The product of its digits is 2667168, while the sum is 54.

The spelling of 12977731386 in words is "twelve billion, nine hundred seventy-seven million, seven hundred thirty-one thousand, three hundred eighty-six".