185185389 has 4 divisors (see below), whose sum is σ = 246913856. Its totient is φ = 123456924.

The previous prime is 185185379. The next prime is 185185393. The reversal of 185185389 is 983581581.

185185389 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 983581581 = 3 ⋅327860527.

It is not a de Polignac number, because 185185389 - 2¹⁶ = 185119853 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (185185309) 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, 30864229 + ... + 30864234.

It is an arithmetic number, because the mean of its divisors is an integer number (61728464).

Almost surely, 2^185185389 is an apocalyptic number.

It is an amenable number.

185185389 is a deficient number, since it is larger than the sum of its proper divisors (61728467).

185185389 is an equidigital number, since it uses as much as digits as its factorization.

185185389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61728466.

The product of its digits is 345600, while the sum is 48.

The square root of 185185389 is about 13608.2838374278. The cubic root of 185185389 is about 569.9921913365.

The spelling of 185185389 in words is "one hundred eighty-five million, one hundred eighty-five thousand, three hundred eighty-nine".