389782861 has 4 divisors (see below), whose sum is σ = 419766172. Its totient is φ = 359799552.

The previous prime is 389782819. The next prime is 389782867. The reversal of 389782861 is 168287983.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 168287983 = 677 ⋅248579.

It can be written as a sum of positive squares in 2 ways, for example, as 131537961 + 258244900 = 11469^2 + 16070^2 .

It is a cyclic number.

It is not a de Polignac number, because 389782861 - 2¹⁵ = 389750093 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 389782799 and 389782808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (389782867) 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, 14991636 + ... + 14991661.

It is an arithmetic number, because the mean of its divisors is an integer number (104941543).

Almost surely, 2^389782861 is an apocalyptic number.

It is an amenable number.

389782861 is a deficient number, since it is larger than the sum of its proper divisors (29983311).

389782861 is a wasteful number, since it uses less digits than its factorization.

389782861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29983310.

The product of its digits is 1161216, while the sum is 52.

The square root of 389782861 is about 19742.9192623583. The cubic root of 389782861 is about 730.4787383270.

The spelling of 389782861 in words is "three hundred eighty-nine million, seven hundred eighty-two thousand, eight hundred sixty-one".