12805881 has 8 divisors (see below), whose sum is σ = 18626784. Its totient is φ = 7761120.

The previous prime is 12805861. The next prime is 12805901. The reversal of 12805881 is 18850821.

It is an interprime number because it is at equal distance from previous prime (12805861) and next prime (12805901).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 12805881 - 2²¹ = 10708729 is a prime.

It is a super-2 number, since 2×12805881² = 327981176372322, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 388057 = 12805881 / (1 + 2 + 8 + 0 + 5 + 8 + 8 + 1).

It is not an unprimeable number, because it can be changed into a prime (12805831) 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, 193996 + ... + 194061.

It is an arithmetic number, because the mean of its divisors is an integer number (2328348).

Almost surely, 2^12805881 is an apocalyptic number.

12805881 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

12805881 is a deficient number, since it is larger than the sum of its proper divisors (5820903).

12805881 is a wasteful number, since it uses less digits than its factorization.

12805881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388071.

The product of its (nonzero) digits is 5120, while the sum is 33.

The square root of 12805881 is about 3578.5305643518. The cubic root of 12805881 is about 233.9572388807.

The spelling of 12805881 in words is "twelve million, eight hundred five thousand, eight hundred eighty-one".