281218238 has 16 divisors (see below), whose sum is σ = 482855904. Its totient is φ = 120330240.

The previous prime is 281218219. The next prime is 281218261. The reversal of 281218238 is 832812182.

281218238 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 281218198 and 281218207.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6695 + ... + 24642.

It is an arithmetic number, because the mean of its divisors is an integer number (30178494).

Almost surely, 2^281218238 is an apocalyptic number.

281218238 is a deficient number, since it is larger than the sum of its proper divisors (201637666).

281218238 is a wasteful number, since it uses less digits than its factorization.

281218238 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31987.

The product of its digits is 12288, while the sum is 35.

The square root of 281218238 is about 16769.5628446301. The cubic root of 281218238 is about 655.1606839235.

The spelling of 281218238 in words is "two hundred eighty-one million, two hundred eighteen thousand, two hundred thirty-eight".