8420789 has 4 divisors (see below), whose sum is σ = 9068556. Its totient is φ = 7773024.

The previous prime is 8420773. The next prime is 8420801. The reversal of 8420789 is 9870248.

8420789 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 4695889 + 3724900 = 2167^2 + 1930^2 .

It is a cyclic number.

It is not a de Polignac number, because 8420789 - 2⁴ = 8420773 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8420749) 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, 323864 + ... + 323889.

It is an arithmetic number, because the mean of its divisors is an integer number (2267139).

Almost surely, 2^8420789 is an apocalyptic number.

It is an amenable number.

8420789 is a deficient number, since it is larger than the sum of its proper divisors (647767).

8420789 is a wasteful number, since it uses less digits than its factorization.

8420789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647766.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 8420789 is about 2901.8595762028. The cubic root of 8420789 is about 203.4468305415.

The spelling of 8420789 in words is "eight million, four hundred twenty thousand, seven hundred eighty-nine".