8631389 has 8 divisors (see below), whose sum is σ = 9356760. Its totient is φ = 7914816.

The previous prime is 8631379. The next prime is 8631391. The reversal of 8631389 is 9831368.

8631389 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 1651225 + 6980164 = 1285^2 + 2642^2 .

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

It is not a de Polignac number, because 8631389 - 2⁴ = 8631373 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 (8631319) 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, 74 + ... + 4155.

It is an arithmetic number, because the mean of its divisors is an integer number (1169595).

Almost surely, 2^8631389 is an apocalyptic number.

It is an amenable number.

8631389 is a deficient number, since it is larger than the sum of its proper divisors (725371).

8631389 is a wasteful number, since it uses less digits than its factorization.

8631389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4399.

The product of its digits is 31104, while the sum is 38.

The square root of 8631389 is about 2937.9225653512. The cubic root of 8631389 is about 205.1289214840.

The spelling of 8631389 in words is "eight million, six hundred thirty-one thousand, three hundred eighty-nine".