389942789 has 4 divisors (see below), whose sum is σ = 390141024. Its totient is φ = 389744556.

The previous prime is 389942743. The next prime is 389942801. The reversal of 389942789 is 987249983.

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: 987249983 = 643 ⋅1535381.

It is a cyclic number.

It is not a de Polignac number, because 389942789 - 2¹² = 389938693 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 (389942389) 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, 96137 + ... + 100110.

It is an arithmetic number, because the mean of its divisors is an integer number (97535256).

Almost surely, 2^389942789 is an apocalyptic number.

It is an amenable number.

389942789 is a deficient number, since it is larger than the sum of its proper divisors (198235).

389942789 is a wasteful number, since it uses less digits than its factorization.

389942789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198234.

The product of its digits is 7838208, while the sum is 59.

The square root of 389942789 is about 19746.9691092076. The cubic root of 389942789 is about 730.5786298660.

The spelling of 389942789 in words is "three hundred eighty-nine million, nine hundred forty-two thousand, seven hundred eighty-nine".