389665879 has 4 divisors (see below), whose sum is σ = 389765176. Its totient is φ = 389566584.

The previous prime is 389665873. The next prime is 389665883. The reversal of 389665879 is 978566983.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 978566983 = 3881 ⋅252143.

It is a cyclic number.

It is not a de Polignac number, because 389665879 - 2¹³ = 389657687 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 (389665873) by changing a digit.

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, 43509 + ... + 51694.

It is an arithmetic number, because the mean of its divisors is an integer number (97441294).

Almost surely, 2^389665879 is an apocalyptic number.

389665879 is a deficient number, since it is larger than the sum of its proper divisors (99297).

389665879 is an equidigital number, since it uses as much as digits as its factorization.

389665879 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99296.

The product of its digits is 19595520, while the sum is 61.

The square root of 389665879 is about 19739.9564082599. The cubic root of 389665879 is about 730.4056536924.

The spelling of 389665879 in words is "three hundred eighty-nine million, six hundred sixty-five thousand, eight hundred seventy-nine".