389435209 has 4 divisors (see below), whose sum is σ = 389498004. Its totient is φ = 389372416.

The previous prime is 389435183. The next prime is 389435227. The reversal of 389435209 is 902534983.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 264777984 + 124657225 = 16272^2 + 11165^2 .

It is a de Polignac number, because none of the positive numbers 2^k-389435209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (389435909) 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, 20932 + ... + 34885.

It is an arithmetic number, because the mean of its divisors is an integer number (97374501).

Almost surely, 2^389435209 is an apocalyptic number.

It is an amenable number.

389435209 is a deficient number, since it is larger than the sum of its proper divisors (62795).

389435209 is an equidigital number, since it uses as much as digits as its factorization.

389435209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62794.

The product of its (nonzero) digits is 233280, while the sum is 43.

The square root of 389435209 is about 19734.1128252577. The cubic root of 389435209 is about 730.2614994843.

The spelling of 389435209 in words is "three hundred eighty-nine million, four hundred thirty-five thousand, two hundred nine".