185281138 has 16 divisors (see below), whose sum is σ = 320711040. Its totient is φ = 78634656.

The previous prime is 185281127. The next prime is 185281183. The reversal of 185281138 is 831182581.

It is a junction number, because it is equal to n+sod(n) for n = 185281097 and 185281106.

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, 62803 + ... + 65686.

It is an arithmetic number, because the mean of its divisors is an integer number (20044440).

Almost surely, 2^185281138 is an apocalyptic number.

185281138 is a deficient number, since it is larger than the sum of its proper divisors (135429902).

185281138 is a wasteful number, since it uses less digits than its factorization.

185281138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128601.

The product of its digits is 15360, while the sum is 37.

The square root of 185281138 is about 13611.8014237646. The cubic root of 185281138 is about 570.0904114305.

The spelling of 185281138 in words is "one hundred eighty-five million, two hundred eighty-one thousand, one hundred thirty-eight".