389378939 has 4 divisors (see below), whose sum is σ = 390463920. Its totient is φ = 388293960.

The previous prime is 389378929. The next prime is 389378959. The reversal of 389378939 is 939873983.

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

It is a cyclic number.

It is not a de Polignac number, because 389378939 - 2²⁰ = 388330363 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (389378929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 541952 + ... + 542669.

It is an arithmetic number, because the mean of its divisors is an integer number (97615980).

Almost surely, 2^389378939 is an apocalyptic number.

389378939 is a deficient number, since it is larger than the sum of its proper divisors (1084981).

389378939 is a wasteful number, since it uses less digits than its factorization.

389378939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1084980.

The product of its digits is 8817984, while the sum is 59.

The square root of 389378939 is about 19732.6870699355. The cubic root of 389378939 is about 730.2263256455.

The spelling of 389378939 in words is "three hundred eighty-nine million, three hundred seventy-eight thousand, nine hundred thirty-nine".