4257522 has 40 divisors (see below), whose sum is σ = 9787932. Its totient is φ = 1382400.

The previous prime is 4257521. The next prime is 4257523. The reversal of 4257522 is 2257524.

It is an interprime number because it is at equal distance from previous prime (4257521) and next prime (4257523).

It can be written as a sum of positive squares in 2 ways, for example, as 4247721 + 9801 = 2061^2 + 99^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (4257521) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6322 + ... + 6962.

Almost surely, 2^4257522 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 4257522, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4893966).

4257522 is an abundant number, since it is smaller than the sum of its proper divisors (5530410).

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

4257522 is a wasteful number, since it uses less digits than its factorization.

4257522 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 696 (or 687 counting only the distinct ones).

The product of its digits is 5600, while the sum is 27.

The square root of 4257522 is about 2063.3763592714. The cubic root of 4257522 is about 162.0760959373.

The spelling of 4257522 in words is "four million, two hundred fifty-seven thousand, five hundred twenty-two".