12740391 has 12 divisors (see below), whose sum is σ = 18492760. Its totient is φ = 8452080.

The previous prime is 12740369. The next prime is 12740423. The reversal of 12740391 is 19304721.

12740391 is a `hidden beast` number, since 1 + 274 + 0 + 391 = 666.

12740391 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12740391 - 2⁵ = 12740359 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12740291) 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, 1456 + ... + 5253.

Almost surely, 2^12740391 is an apocalyptic number.

12740391 is a deficient number, since it is larger than the sum of its proper divisors (5752369).

12740391 is a wasteful number, since it uses less digits than its factorization.

12740391 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6926 (or 6923 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 12740391 is about 3569.3684315296. The cubic root of 12740391 is about 233.5577335548.

It can be divided in two parts, 12740 and 391, that added together give a palindrome (13131).

The spelling of 12740391 in words is "twelve million, seven hundred forty thousand, three hundred ninety-one".