4222640 has 20 divisors (see below), whose sum is σ = 9817824. Its totient is φ = 1689024.

The previous prime is 4222637. The next prime is 4222649. The reversal of 4222640 is 462224.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a d-powerful number, because it can be written as 4² + 2¹² + 2¹⁴ + 2²² + 6⁵ + 4³ + 0 .

It is not an unprimeable number, because it can be changed into a prime (4222649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26312 + ... + 26471.

Almost surely, 2^4222640 is an apocalyptic number.

4222640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

4222640 is an abundant number, since it is smaller than the sum of its proper divisors (5595184).

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

4222640 is a wasteful number, since it uses less digits than its factorization.

4222640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52796 (or 52790 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 4222640 is about 2054.9063238990. The cubic root of 4222640 is about 161.6322502050.

Adding to 4222640 its reverse (462224), we get a palindrome (4684864).

The spelling of 4222640 in words is "four million, two hundred twenty-two thousand, six hundred forty".