8420040 has 96 divisors (see below), whose sum is σ = 28828800. Its totient is φ = 2125440.

The previous prime is 8420029. The next prime is 8420051. The reversal of 8420040 is 400248.

It is a happy number.

8420040 is digitally balanced in base 5, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (8420029) and next prime (8420051).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 8419995 and 8420022.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6225 + ... + 7455.

It is an arithmetic number, because the mean of its divisors is an integer number (300300).

Almost surely, 2^8420040 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 8420040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (14414400).

8420040 is an abundant number, since it is smaller than the sum of its proper divisors (20408760).

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

8420040 is a wasteful number, since it uses less digits than its factorization.

8420040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1267 (or 1260 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 8420040 is about 2901.7305181564. The cubic root of 8420040 is about 203.4407983991.

Adding to 8420040 its reverse (400248), we get a palindrome (8820288).

The spelling of 8420040 in words is "eight million, four hundred twenty thousand, forty".