8455840 has 48 divisors (see below), whose sum is σ = 20480040. Its totient is φ = 3297280.

The previous prime is 8455829. The next prime is 8455841. The reversal of 8455840 is 485548.

It can be written as a sum of positive squares in 4 ways, for example, as 5934096 + 2521744 = 2436^2 + 1588^2 .

It is a junction number, because it is equal to n+sod(n) for n = 8455796 and 8455805.

It is not an unprimeable number, because it can be changed into a prime (8455841) 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, 5916 + ... + 7204.

Almost surely, 2^8455840 is an apocalyptic number.

8455840 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 8455840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10240020).

8455840 is an abundant number, since it is smaller than the sum of its proper divisors (12024200).

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

8455840 is a wasteful number, since it uses less digits than its factorization.

8455840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1345 (or 1337 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 34.

The square root of 8455840 is about 2907.8927077869. The cubic root of 8455840 is about 203.7287179648.

The spelling of 8455840 in words is "eight million, four hundred fifty-five thousand, eight hundred forty".