389661789 has 24 divisors (see below), whose sum is σ = 571529952. Its totient is φ = 234193920.

The previous prime is 389661787. The next prime is 389661803. The reversal of 389661789 is 987166983.

It is not a de Polignac number, because 389661789 - 2¹ = 389661787 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (389661787) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1229059 + ... + 1229375.

It is an arithmetic number, because the mean of its divisors is an integer number (23813748).

Almost surely, 2^389661789 is an apocalyptic number.

It is an amenable number.

389661789 is a deficient number, since it is larger than the sum of its proper divisors (181868163).

389661789 is a wasteful number, since it uses less digits than its factorization.

389661789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 717 (or 524 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 57.

The square root of 389661789 is about 19739.8528110014. The cubic root of 389661789 is about 730.4030981957.

It can be divided in two parts, 38966 and 1789, that added together give a triangular number (40755 = T₂₈₅).

The spelling of 389661789 in words is "three hundred eighty-nine million, six hundred sixty-one thousand, seven hundred eighty-nine".