12871820 has 48 divisors (see below), whose sum is σ = 30067968. Its totient is φ = 4596480.

The previous prime is 12871811. The next prime is 12871841. The reversal of 12871820 is 2817821.

It is a super-2 number, since 2×12871820² = 331367500224800, which contains 22 as substring.

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, 7262 + ... + 8858.

It is an arithmetic number, because the mean of its divisors is an integer number (626416).

Almost surely, 2^12871820 is an apocalyptic number.

12871820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 12871820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15033984).

12871820 is an abundant number, since it is smaller than the sum of its proper divisors (17196148).

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

12871820 is a wasteful number, since it uses less digits than its factorization.

12871820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1650 (or 1648 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 29.

The square root of 12871820 is about 3587.7318740396. The cubic root of 12871820 is about 234.3581094791.

The spelling of 12871820 in words is "twelve million, eight hundred seventy-one thousand, eight hundred twenty".