4251220 has 12 divisors (see below), whose sum is σ = 8927604. Its totient is φ = 1700480.

The previous prime is 4251199. The next prime is 4251223. The reversal of 4251220 is 221524.

It can be written as a sum of positive squares in 2 ways, for example, as 3161284 + 1089936 = 1778^2 + 1044^2 .

It is a junction number, because it is equal to n+sod(n) for n = 4251194 and 4251203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4251223) 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, 106261 + ... + 106300.

It is an arithmetic number, because the mean of its divisors is an integer number (743967).

Almost surely, 2^4251220 is an apocalyptic number.

It is an amenable number.

4251220 is an abundant number, since it is smaller than the sum of its proper divisors (4676384).

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

4251220 is a wasteful number, since it uses less digits than its factorization.

4251220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 212570 (or 212568 counting only the distinct ones).

The product of its (nonzero) digits is 160, while the sum is 16.

The square root of 4251220 is about 2061.8486850397. The cubic root of 4251220 is about 161.9960879002.

Adding to 4251220 its reverse (221524), we get a palindrome (4472744).

The spelling of 4251220 in words is "four million, two hundred fifty-one thousand, two hundred twenty".