185489138 has 8 divisors (see below), whose sum is σ = 278580060. Its totient is φ = 92629120.

The previous prime is 185489137. The next prime is 185489141. The reversal of 185489138 is 831984581.

It can be written as a sum of positive squares in 2 ways, for example, as 161213809 + 24275329 = 12697^2 + 4927^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 185489092 and 185489101.

It is not an unprimeable number, because it can be changed into a prime (185489137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55703 + ... + 58938.

Almost surely, 2^185489138 is an apocalyptic number.

185489138 is a deficient number, since it is larger than the sum of its proper divisors (93090922).

185489138 is a wasteful number, since it uses less digits than its factorization.

185489138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115452.

The product of its digits is 276480, while the sum is 47.

The square root of 185489138 is about 13619.4397094741. The cubic root of 185489138 is about 570.3036629638.

The spelling of 185489138 in words is "one hundred eighty-five million, four hundred eighty-nine thousand, one hundred thirty-eight".