12861810 has 48 divisors (see below), whose sum is σ = 36016344. Its totient is φ = 3165696.

The previous prime is 12861791. The next prime is 12861817. The reversal of 12861810 is 1816821.

It can be written as a sum of positive squares in 4 ways, for example, as 5716881 + 7144929 = 2391^2 + 2673^2 .

It is a super-2 number, since 2×12861810² = 330852312952200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12861817) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4327 + ... + 6666.

Almost surely, 2^12861810 is an apocalyptic number.

12861810 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12861810 is an abundant number, since it is smaller than the sum of its proper divisors (23154534).

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

12861810 is a wasteful number, since it uses less digits than its factorization.

12861810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11019 (or 11016 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 27.

The square root of 12861810 is about 3586.3365709314. The cubic root of 12861810 is about 234.2973428054.

The spelling of 12861810 in words is "twelve million, eight hundred sixty-one thousand, eight hundred ten".