320281138 has 16 divisors (see below), whose sum is σ = 506841120. Its totient is φ = 151371936.

The previous prime is 320281109. The next prime is 320281153. The reversal of 320281138 is 831182023.

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, 8145 + ... + 26587.

It is an arithmetic number, because the mean of its divisors is an integer number (31677570).

Almost surely, 2^320281138 is an apocalyptic number.

320281138 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

320281138 is a deficient number, since it is larger than the sum of its proper divisors (186559982).

320281138 is a wasteful number, since it uses less digits than its factorization.

320281138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18921.

The product of its (nonzero) digits is 2304, while the sum is 28.

The square root of 320281138 is about 17896.4001408104. The cubic root of 320281138 is about 684.1906280460.

The spelling of 320281138 in words is "three hundred twenty million, two hundred eighty-one thousand, one hundred thirty-eight".