12781284 has 24 divisors (see below), whose sum is σ = 31120320. Its totient is φ = 4075104.

The previous prime is 12781271. The next prime is 12781291. The reversal of 12781284 is 48218721.

It is a happy number.

It is a super-2 number, since 2×12781284² = 326722441377312, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22879 + ... + 23430.

It is an arithmetic number, because the mean of its divisors is an integer number (1296680).

Almost surely, 2^12781284 is an apocalyptic number.

It is an amenable number.

12781284 is an abundant number, since it is smaller than the sum of its proper divisors (18339036).

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

12781284 is a wasteful number, since it uses less digits than its factorization.

12781284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 46339 (or 46337 counting only the distinct ones).

The product of its digits is 7168, while the sum is 33.

The square root of 12781284 is about 3575.0921666441. The cubic root of 12781284 is about 233.8073511177.

The spelling of 12781284 in words is "twelve million, seven hundred eighty-one thousand, two hundred eighty-four".