12681940 has 12 divisors (see below), whose sum is σ = 26632116. Its totient is φ = 5072768.

The previous prime is 12681937. The next prime is 12681959. The reversal of 12681940 is 4918621.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 3549456 + 9132484 = 1884^2 + 3022^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 317029 + ... + 317068.

It is an arithmetic number, because the mean of its divisors is an integer number (2219343).

Almost surely, 2^12681940 is an apocalyptic number.

12681940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12681940 is an abundant number, since it is smaller than the sum of its proper divisors (13950176).

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

12681940 is a wasteful number, since it uses less digits than its factorization.

12681940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634106 (or 634104 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 31.

The square root of 12681940 is about 3561.1711556734. The cubic root of 12681940 is about 233.2000100033.

The spelling of 12681940 in words is "twelve million, six hundred eighty-one thousand, nine hundred forty".