12561804 has 60 divisors (see below), whose sum is σ = 33195624. Its totient is φ = 4142016.

The previous prime is 12561803. The next prime is 12561823. The reversal of 12561804 is 40816521.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (12561803) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 44247 + ... + 44529.

Almost surely, 2^12561804 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12561804, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (16597812).

12561804 is an abundant number, since it is smaller than the sum of its proper divisors (20633820).

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

12561804 is a wasteful number, since it uses less digits than its factorization.

12561804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 436 (or 425 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 27.

The square root of 12561804 is about 3544.2635342198. The cubic root of 12561804 is about 232.4613046945.

The spelling of 12561804 in words is "twelve million, five hundred sixty-one thousand, eight hundred four".