8389440 has 112 divisors (see below), whose sum is σ = 29626560. Its totient is φ = 2234880.

The previous prime is 8389373. The next prime is 8389441. The reversal of 8389440 is 449838.

8389440 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 8389395 and 8389404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8389441) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8155 + ... + 9125.

Almost surely, 2^8389440 is an apocalyptic number.

8389440 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8389440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14813280).

8389440 is an abundant number, since it is smaller than the sum of its proper divisors (21237120).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

8389440 is a wasteful number, since it uses less digits than its factorization.

8389440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 997 (or 981 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 8389440 is about 2896.4530032438. The cubic root of 8389440 is about 203.1940519473.

The spelling of 8389440 in words is "eight million, three hundred eighty-nine thousand, four hundred forty".