389312761 has 4 divisors (see below), whose sum is σ = 389480292. Its totient is φ = 389145232.

The previous prime is 389312741. The next prime is 389312783. The reversal of 389312761 is 167213983.

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

It can be written as a sum of positive squares in 2 ways, for example, as 70476025 + 318836736 = 8395^2 + 17856^2 .

It is a cyclic number.

It is not a de Polignac number, because 389312761 - 2⁷ = 389312633 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (389312741) 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, 80230 + ... + 84943.

It is an arithmetic number, because the mean of its divisors is an integer number (97370073).

Almost surely, 2^389312761 is an apocalyptic number.

It is an amenable number.

389312761 is a deficient number, since it is larger than the sum of its proper divisors (167531).

389312761 is a wasteful number, since it uses less digits than its factorization.

389312761 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 167530.

The product of its digits is 54432, while the sum is 40.

The square root of 389312761 is about 19731.0101363311. The cubic root of 389312761 is about 730.1849540740.

The spelling of 389312761 in words is "three hundred eighty-nine million, three hundred twelve thousand, seven hundred sixty-one".