12909940 has 12 divisors (see below), whose sum is σ = 27110916. Its totient is φ = 5163968.

The previous prime is 12909937. The next prime is 12909961. The reversal of 12909940 is 4990921.

It can be written as a sum of positive squares in 2 ways, for example, as 8797156 + 4112784 = 2966^2 + 2028^2 .

It is a junction number, because it is equal to n+sod(n) for n = 12909896 and 12909905.

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, 322729 + ... + 322768.

It is an arithmetic number, because the mean of its divisors is an integer number (2259243).

Almost surely, 2^12909940 is an apocalyptic number.

12909940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12909940 is an abundant number, since it is smaller than the sum of its proper divisors (14200976).

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

12909940 is a wasteful number, since it uses less digits than its factorization.

12909940 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645506 (or 645504 counting only the distinct ones).

The product of its (nonzero) digits is 5832, while the sum is 34.

The square root of 12909940 is about 3593.0404951795. The cubic root of 12909940 is about 234.5892326227.

The spelling of 12909940 in words is "twelve million, nine hundred nine thousand, nine hundred forty".