12261858 has 48 divisors (see below), whose sum is σ = 28810080. Its totient is φ = 3468864.

The previous prime is 12261817. The next prime is 12261889. The reversal of 12261858 is 85816221.

It is a super-2 number, since 2×12261858² = 300706323224328, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 52510 + ... + 52742.

It is an arithmetic number, because the mean of its divisors is an integer number (600210).

Almost surely, 2^12261858 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12261858, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14405040).

12261858 is an abundant number, since it is smaller than the sum of its proper divisors (16548222).

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

12261858 is a wasteful number, since it uses less digits than its factorization.

12261858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 431 (or 424 counting only the distinct ones).

The product of its digits is 7680, while the sum is 33.

The square root of 12261858 is about 3501.6935902503. The cubic root of 12261858 is about 230.5961723208.

The spelling of 12261858 in words is "twelve million, two hundred sixty-one thousand, eight hundred fifty-eight".