12691340 has 12 divisors (see below), whose sum is σ = 26651856. Its totient is φ = 5076528.

The previous prime is 12691337. The next prime is 12691361. The reversal of 12691340 is 4319621.

It is a super-2 number, since 2×12691340² = 322140221991200, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 317264 + ... + 317303.

It is an arithmetic number, because the mean of its divisors is an integer number (2220988).

Almost surely, 2^12691340 is an apocalyptic number.

12691340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12691340 is an abundant number, since it is smaller than the sum of its proper divisors (13960516).

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

12691340 is a wasteful number, since it uses less digits than its factorization.

12691340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634576 (or 634574 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 12691340 is about 3562.4907017423. The cubic root of 12691340 is about 233.2576126182.

It can be divided in two parts, 12691 and 340, that added together give a palindrome (13031).

The spelling of 12691340 in words is "twelve million, six hundred ninety-one thousand, three hundred forty".