4221528 has 16 divisors (see below), whose sum is σ = 10553880. Its totient is φ = 1407168.

The previous prime is 4221521. The next prime is 4221533. The reversal of 4221528 is 8251224.

It is a super-3 number, since 3×4221528³ (a number of 21 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (24), and also a Moran number because the ratio is a prime number: 175897 = 4221528 / (4 + 2 + 2 + 1 + 5 + 2 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 4221498 and 4221507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4221521) 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, 87925 + ... + 87972.

Almost surely, 2^4221528 is an apocalyptic number.

It is an amenable number.

4221528 is an abundant number, since it is smaller than the sum of its proper divisors (6332352).

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

4221528 is a wasteful number, since it uses less digits than its factorization.

4221528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175906 (or 175902 counting only the distinct ones).

The product of its digits is 1280, while the sum is 24.

The square root of 4221528 is about 2054.6357341388. The cubic root of 4221528 is about 161.6180607530.

The spelling of 4221528 in words is "four million, two hundred twenty-one thousand, five hundred twenty-eight".