12840355 has 32 divisors (see below), whose sum is σ = 18413568. Its totient is φ = 8486400.

The previous prime is 12840343. The next prime is 12840361. The reversal of 12840355 is 55304821.

12840355 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 12840355 - 2⁵ = 12840323 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 28764 + ... + 29206.

It is an arithmetic number, because the mean of its divisors is an integer number (575424).

Almost surely, 2^12840355 is an apocalyptic number.

12840355 is a deficient number, since it is larger than the sum of its proper divisors (5573213).

12840355 is a wasteful number, since it uses less digits than its factorization.

12840355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 507.

The product of its (nonzero) digits is 4800, while the sum is 28.

The square root of 12840355 is about 3583.3441085109. The cubic root of 12840355 is about 234.1669918619.

The spelling of 12840355 in words is "twelve million, eight hundred forty thousand, three hundred fifty-five".