12840858 has 12 divisors (see below), whose sum is σ = 27821898. Its totient is φ = 4280280.

The previous prime is 12840833. The next prime is 12840859. The reversal of 12840858 is 85804821.

It can be written as a sum of positive squares in only one way, i.e., 12766329 + 74529 = 3573^2 + 273^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (12840859) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 356673 + ... + 356708.

Almost surely, 2^12840858 is an apocalyptic number.

12840858 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

12840858 is an abundant number, since it is smaller than the sum of its proper divisors (14981040).

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

12840858 is a wasteful number, since it uses less digits than its factorization.

12840858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 713389 (or 713386 counting only the distinct ones).

The product of its (nonzero) digits is 20480, while the sum is 36.

The square root of 12840858 is about 3583.4142936591. The cubic root of 12840858 is about 234.1700495255.

The spelling of 12840858 in words is "twelve million, eight hundred forty thousand, eight hundred fifty-eight".