4221810 has 48 divisors (see below), whose sum is σ = 11171160. Its totient is φ = 1105920.

The previous prime is 4221799. The next prime is 4221827. The reversal of 4221810 is 181224.

It can be written as a sum of positive squares in 4 ways, for example, as 1962801 + 2259009 = 1401^2 + 1503^2 .

It is a super-2 number, since 2×4221810² = 35647359352200, which contains 22 as substring.

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

It is a Curzon number.

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, 5106 + ... + 5874.

Almost surely, 2^4221810 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4221810, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5585580).

4221810 is an abundant number, since it is smaller than the sum of its proper divisors (6949350).

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

4221810 is a wasteful number, since it uses less digits than its factorization.

4221810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 843 (or 840 counting only the distinct ones).

The product of its (nonzero) digits is 128, while the sum is 18.

The square root of 4221810 is about 2054.7043582959. The cubic root of 4221810 is about 161.6216593930.

The spelling of 4221810 in words is "four million, two hundred twenty-one thousand, eight hundred ten".