12786381 has 12 divisors (see below), whose sum is σ = 18500352. Its totient is φ = 8509896.

The previous prime is 12786379. The next prime is 12786391. The reversal of 12786381 is 18368721.

12786381 is a `hidden beast` number, since 1 + 278 + 6 + 381 = 666.

12786381 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12786381 - 2¹ = 12786379 is a prime.

It is a super-2 number, since 2×12786381² = 326983078154322, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12786311) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9130 + ... + 10436.

It is an arithmetic number, because the mean of its divisors is an integer number (1541696).

Almost surely, 2^12786381 is an apocalyptic number.

It is an amenable number.

12786381 is a deficient number, since it is larger than the sum of its proper divisors (5713971).

12786381 is a wasteful number, since it uses less digits than its factorization.

12786381 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2400 (or 2397 counting only the distinct ones).

The product of its digits is 16128, while the sum is 36.

The square root of 12786381 is about 3575.8049443447. The cubic root of 12786381 is about 233.8384267043.

The spelling of 12786381 in words is "twelve million, seven hundred eighty-six thousand, three hundred eighty-one".