12831858 has 56 divisors (see below), whose sum is σ = 31124268. Its totient is φ = 3942432.

The previous prime is 12831857. The next prime is 12831869. The reversal of 12831858 is 85813821.

12831858 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 12510369 + 321489 = 3537^2 + 567^2 .

It is not an unprimeable number, because it can be changed into a prime (12831857) by changing a digit.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 18616 + ... + 19292.

Almost surely, 2^12831858 is an apocalyptic number.

12831858 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 12831858, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15562134).

12831858 is an abundant number, since it is smaller than the sum of its proper divisors (18292410).

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

12831858 is an equidigital number, since it uses as much as digits as its factorization.

12831858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 710 (or 695 counting only the distinct ones).

The product of its digits is 15360, while the sum is 36.

The square root of 12831858 is about 3582.1582879599. The cubic root of 12831858 is about 234.1153277663.

It can be divided in two parts, 12831 and 858, that added together give a square (13689 = 117²).

The spelling of 12831858 in words is "twelve million, eight hundred thirty-one thousand, eight hundred fifty-eight".