12881820 has 48 divisors (see below), whose sum is σ = 41223168. Its totient is φ = 2944320.

The previous prime is 12881789. The next prime is 12881839. The reversal of 12881820 is 2818821.

12881820 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 14916 + ... + 15755.

It is an arithmetic number, because the mean of its divisors is an integer number (858816).

Almost surely, 2^12881820 is an apocalyptic number.

12881820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12881820 is an abundant number, since it is smaller than the sum of its proper divisors (28341348).

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

12881820 is a wasteful number, since it uses less digits than its factorization.

12881820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30690 (or 30688 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 30.

The square root of 12881820 is about 3589.1252416153. The cubic root of 12881820 is about 234.4187839979.

The spelling of 12881820 in words is "twelve million, eight hundred eighty-one thousand, eight hundred twenty".