389845 has 4 divisors (see below), whose sum is σ = 467820. Its totient is φ = 311872.

The previous prime is 389839. The next prime is 389849. The reversal of 389845 is 548983.

389845 = 441² + 442².

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 548983 = 239 ⋅2297.

It can be written as a sum of positive squares in 2 ways, for example, as 195364 + 194481 = 442^2 + 441^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-389845 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (389849) 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, 38980 + ... + 38989.

It is an arithmetic number, because the mean of its divisors is an integer number (116955).

2³⁸⁹⁸⁴⁵ is an apocalyptic number.

389845 is the 442-nd centered square number.

It is an amenable number.

389845 is a deficient number, since it is larger than the sum of its proper divisors (77975).

389845 is an equidigital number, since it uses as much as digits as its factorization.

389845 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77974.

The product of its digits is 34560, while the sum is 37.

The square root of 389845 is about 624.3756881878. The cubic root of 389845 is about 73.0517553790.

The spelling of 389845 in words is "three hundred eighty-nine thousand, eight hundred forty-five".