12781433 has 16 divisors (see below), whose sum is σ = 16283520. Its totient is φ = 9766656.

The previous prime is 12781429. The next prime is 12781441. The reversal of 12781433 is 33418721.

12781433 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 12781433 - 2² = 12781429 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 12781396 and 12781405.

It is not an unprimeable number, because it can be changed into a prime (12781423) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 566 + ... + 5087.

It is an arithmetic number, because the mean of its divisors is an integer number (1017720).

Almost surely, 2^12781433 is an apocalyptic number.

It is an amenable number.

12781433 is a deficient number, since it is larger than the sum of its proper divisors (3502087).

12781433 is a wasteful number, since it uses less digits than its factorization.

12781433 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5696.

The product of its digits is 4032, while the sum is 29.

The square root of 12781433 is about 3575.1130052070. The cubic root of 12781433 is about 233.8082596639.

The spelling of 12781433 in words is "twelve million, seven hundred eighty-one thousand, four hundred thirty-three".