421528 has 8 divisors (see below), whose sum is σ = 790380. Its totient is φ = 210760.

The previous prime is 421517. The next prime is 421559. The reversal of 421528 is 825124.

It is a tau number, because it is divible by the number of its divisors (8).

It is a junction number, because it is equal to n+sod(n) for n = 421499 and 421508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26338 + ... + 26353.

2⁴²¹⁵²⁸ is an apocalyptic number.

It is an amenable number.

421528 is a deficient number, since it is larger than the sum of its proper divisors (368852).

421528 is a wasteful number, since it uses less digits than its factorization.

421528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52697 (or 52693 counting only the distinct ones).

The product of its digits is 640, while the sum is 22.

The square root of 421528 is about 649.2518771632. The cubic root of 421528 is about 74.9794313967.

It can be divided in two parts, 421 and 528, that added together give a palindrome (949).

The spelling of 421528 in words is "four hundred twenty-one thousand, five hundred twenty-eight".