389381309 has 4 divisors (see below), whose sum is σ = 390311040. Its totient is φ = 388451580.

The previous prime is 389381281. The next prime is 389381327. The reversal of 389381309 is 903183983.

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: 903183983 = 13 ⋅69475691.

It is a cyclic number.

It is not a de Polignac number, because 389381309 - 2²⁰ = 388332733 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 389381309.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (389381339) 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, 464237 + ... + 465074.

It is an arithmetic number, because the mean of its divisors is an integer number (97577760).

Almost surely, 2^389381309 is an apocalyptic number.

It is an amenable number.

389381309 is a deficient number, since it is larger than the sum of its proper divisors (929731).

389381309 is an equidigital number, since it uses as much as digits as its factorization.

389381309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 929730.

The product of its (nonzero) digits is 139968, while the sum is 44.

The square root of 389381309 is about 19732.7471224865. The cubic root of 389381309 is about 730.2278071781.

The spelling of 389381309 in words is "three hundred eighty-nine million, three hundred eighty-one thousand, three hundred nine".