12783240 has 48 divisors (see below), whose sum is σ = 41546700. Its totient is φ = 3408768.

The previous prime is 12783223. The next prime is 12783283. The reversal of 12783240 is 4238721.

It can be written as a sum of positive squares in 2 ways, for example, as 11655396 + 1127844 = 3414^2 + 1062^2 .

It is a super-2 number, since 2×12783240² = 326822449795200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17395 + ... + 18114.

Almost surely, 2^12783240 is an apocalyptic number.

12783240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12783240 is an abundant number, since it is smaller than the sum of its proper divisors (28763460).

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

12783240 is a wasteful number, since it uses less digits than its factorization.

12783240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35526 (or 35519 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 12783240 is about 3575.3657155597. The cubic root of 12783240 is about 233.8192775108.

The spelling of 12783240 in words is "twelve million, seven hundred eighty-three thousand, two hundred forty".