12891804 has 24 divisors (see below), whose sum is σ = 31664640. Its totient is φ = 4071024.

The previous prime is 12891803. The next prime is 12891811. The reversal of 12891804 is 40819821.

12891804 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×12891804² = 332397220748832, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12891803) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28044 + ... + 28499.

It is an arithmetic number, because the mean of its divisors is an integer number (1319360).

Almost surely, 2^12891804 is an apocalyptic number.

It is an amenable number.

12891804 is an abundant number, since it is smaller than the sum of its proper divisors (18772836).

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

12891804 is a wasteful number, since it uses less digits than its factorization.

12891804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56569 (or 56567 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 33.

The square root of 12891804 is about 3590.5158403773. The cubic root of 12891804 is about 234.4793301203.

It can be divided in two parts, 12891 and 804, that added together give a triangular number (13695 = T₁₆₅).

The spelling of 12891804 in words is "twelve million, eight hundred ninety-one thousand, eight hundred four".