6220440 has 96 divisors (see below), whose sum is σ = 20807280. Its totient is φ = 1610496.

The previous prime is 6220433. The next prime is 6220447. The reversal of 6220440 is 440226.

6220440 is a `hidden beast` number, since 6 + 220 + 440 = 666.

It is an interprime number because it is at equal distance from previous prime (6220433) and next prime (6220447).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6220447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 13087 + ... + 13553.

Almost surely, 2^6220440 is an apocalyptic number.

6220440 is a gapful number since it is divisible by the number (60) 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 6220440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (10403640).

6220440 is an abundant number, since it is smaller than the sum of its proper divisors (14586840).

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

6220440 is a wasteful number, since it uses less digits than its factorization.

6220440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 521 (or 514 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 6220440 is about 2494.0809930714. The cubic root of 6220440 is about 183.9107159772.

Adding to 6220440 its reverse (440226), we get a palindrome (6660666).

It can be divided in two parts, 62 and 20440, that added together give a palindrome (20502).

The spelling of 6220440 in words is "six million, two hundred twenty thousand, four hundred forty".