12742840 has 32 divisors (see below), whose sum is σ = 31278960. Its totient is φ = 4633600.

The previous prime is 12742823. The next prime is 12742871. The reversal of 12742840 is 4824721.

It is a junction number, because it is equal to n+sod(n) for n = 12742799 and 12742808.

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, 14041 + ... + 14920.

Almost surely, 2^12742840 is an apocalyptic number.

12742840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12742840 is an abundant number, since it is smaller than the sum of its proper divisors (18536120).

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

12742840 is a wasteful number, since it uses less digits than its factorization.

12742840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28983 (or 28979 counting only the distinct ones).

The product of its (nonzero) digits is 3584, while the sum is 28.

The square root of 12742840 is about 3569.7114729345. The cubic root of 12742840 is about 233.5726976755.

It can be divided in two parts, 1274 and 2840, that added together give a palindrome (4114).

The spelling of 12742840 in words is "twelve million, seven hundred forty-two thousand, eight hundred forty".