4220538 has 24 divisors (see below), whose sum is σ = 9677472. Its totient is φ = 1202064.

The previous prime is 4220537. The next prime is 4220543. The reversal of 4220538 is 8350224.

It is an Ulam number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (4220533) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13156 + ... + 13472.

It is an arithmetic number, because the mean of its divisors is an integer number (403228).

Almost surely, 2^4220538 is an apocalyptic number.

4220538 is an abundant number, since it is smaller than the sum of its proper divisors (5456934).

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

4220538 is an equidigital number, since it uses as much as digits as its factorization.

4220538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 646 (or 329 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 4220538 is about 2054.3948013953. The cubic root of 4220538 is about 161.6054259607.

The spelling of 4220538 in words is "four million, two hundred twenty thousand, five hundred thirty-eight".