12691140 has 192 divisors, whose sum is σ = 46061568. Its totient is φ = 2534400.

The previous prime is 12691109. The next prime is 12691169. The reversal of 12691140 is 4119621.

It is a super-2 number, since 2×12691140² = 322130068999200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12691140.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 189387 + ... + 189453.

It is an arithmetic number, because the mean of its divisors is an integer number (239904).

Almost surely, 2^12691140 is an apocalyptic number.

12691140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12691140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23030784).

12691140 is an abundant number, since it is smaller than the sum of its proper divisors (33370428).

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

12691140 is a wasteful number, since it uses less digits than its factorization.

12691140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 138 (or 136 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 24.

The square root of 12691140 is about 3562.4626313830. The cubic root of 12691140 is about 233.2563873268.

The spelling of 12691140 in words is "twelve million, six hundred ninety-one thousand, one hundred forty".