42789 has 8 divisors (see below), whose sum is σ = 60480. Its totient is φ = 26816.

The previous prime is 42787. The next prime is 42793. The reversal of 42789 is 98724.

42789 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 42789 - 2¹ = 42787 is a prime.

42789 is a lucky number.

It is a plaindrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42787) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 369 + ... + 470.

It is an arithmetic number, because the mean of its divisors is an integer number (7560).

2⁴²⁷⁸⁹ is an apocalyptic number.

It is an amenable number.

42789 is a deficient number, since it is larger than the sum of its proper divisors (17691).

42789 is a wasteful number, since it uses less digits than its factorization.

42789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 859.

The product of its digits is 4032, while the sum is 30.

The square root of 42789 is about 206.8550216939. The cubic root of 42789 is about 34.9765829756.

The spelling of 42789 in words is "forty-two thousand, seven hundred eighty-nine".