389533505 has 4 divisors (see below), whose sum is σ = 467440212. Its totient is φ = 311626800.

The previous prime is 389533499. The next prime is 389533513. The reversal of 389533505 is 505335983.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 505335983 = 421 ⋅1200323.

It can be written as a sum of positive squares in 2 ways, for example, as 249513616 + 140019889 = 15796^2 + 11833^2 .

It is not a de Polignac number, because 389533505 - 2⁴ = 389533489 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38953346 + ... + 38953355.

It is an arithmetic number, because the mean of its divisors is an integer number (116860053).

Almost surely, 2^389533505 is an apocalyptic number.

It is an amenable number.

389533505 is a deficient number, since it is larger than the sum of its proper divisors (77906707).

389533505 is an equidigital number, since it uses as much as digits as its factorization.

389533505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77906706.

The product of its (nonzero) digits is 243000, while the sum is 41.

The square root of 389533505 is about 19736.6031778521. The cubic root of 389533505 is about 730.3229352458.

The spelling of 389533505 in words is "three hundred eighty-nine million, five hundred thirty-three thousand, five hundred five".