281981439 has 8 divisors (see below), whose sum is σ = 417750320. Its totient is φ = 187987608.

The previous prime is 281981437. The next prime is 281981501. The reversal of 281981439 is 934189182.

281981439 is a `hidden beast` number, since 28 + 198 + 1 + 439 = 666.

It is not a de Polignac number, because 281981439 - 2¹ = 281981437 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 281981394 and 281981403.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (281981437) 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, 5221852 + ... + 5221905.

It is an arithmetic number, because the mean of its divisors is an integer number (52218790).

Almost surely, 2^281981439 is an apocalyptic number.

281981439 is a deficient number, since it is larger than the sum of its proper divisors (135768881).

281981439 is a wasteful number, since it uses less digits than its factorization.

281981439 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10443766 (or 10443760 counting only the distinct ones).

The product of its digits is 124416, while the sum is 45.

The square root of 281981439 is about 16792.3029689200. The cubic root of 281981439 is about 655.7528309546.

The spelling of 281981439 in words is "two hundred eighty-one million, nine hundred eighty-one thousand, four hundred thirty-nine".