12809240 has 32 divisors (see below), whose sum is σ = 28998000. Its totient is φ = 5092224.

The previous prime is 12809221. The next prime is 12809281. The reversal of 12809240 is 4290821.

It is a Cunningham number, because it is equal to 3579²-1.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6266 + ... + 8054.

Almost surely, 2^12809240 is an apocalyptic number.

12809240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12809240 is an abundant number, since it is smaller than the sum of its proper divisors (16188760).

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

12809240 is a wasteful number, since it uses less digits than its factorization.

12809240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1979 (or 1975 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 26.

The square root of 12809240 is about 3578.9998602962. Note that the first 3 decimals coincide. The cubic root of 12809240 is about 233.9776928598.

The spelling of 12809240 in words is "twelve million, eight hundred nine thousand, two hundred forty".