12840428 has 24 divisors (see below), whose sum is σ = 23889600. Its totient is φ = 6021648.

The previous prime is 12840427. The next prime is 12840461. The reversal of 12840428 is 82404821.

It is a self number, because there is not a number n which added to its sum of digits gives 12840428.

It is not an unprimeable number, because it can be changed into a prime (12840427) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7343 + ... + 8921.

It is an arithmetic number, because the mean of its divisors is an integer number (995400).

Almost surely, 2^12840428 is an apocalyptic number.

It is an amenable number.

12840428 is a deficient number, since it is larger than the sum of its proper divisors (11049172).

12840428 is a wasteful number, since it uses less digits than its factorization.

12840428 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1709 (or 1707 counting only the distinct ones).

The product of its (nonzero) digits is 4096, while the sum is 29.

The square root of 12840428 is about 3583.3542945123. The cubic root of 12840428 is about 234.1674356232.

The spelling of 12840428 in words is "twelve million, eight hundred forty thousand, four hundred twenty-eight".