8381040 has 80 divisors (see below), whose sum is σ = 26569728. Its totient is φ = 2184448.

The previous prime is 8381003. The next prime is 8381047. The reversal of 8381040 is 401838.

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 8381040.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8381047) 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, 10909 + ... + 11651.

Almost surely, 2^8381040 is an apocalyptic number.

8381040 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 8381040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (13284864).

8381040 is an abundant number, since it is smaller than the sum of its proper divisors (18188688).

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

8381040 is a wasteful number, since it uses less digits than its factorization.

8381040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 806 (or 800 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 24.

The square root of 8381040 is about 2895.0025906724. The cubic root of 8381040 is about 203.1262126949.

Adding to 8381040 its reverse (401838), we get a palindrome (8782878).

The spelling of 8381040 in words is "eight million, three hundred eighty-one thousand, forty".