421809525 has 60 divisors (see below), whose sum is σ = 827365572. Its totient is φ = 211714560.

The previous prime is 421809523. The next prime is 421809533. The reversal of 421809525 is 525908124.

It can be written as a sum of positive squares in 6 ways, for example, as 81 + 421809444 = 9^2 + 20538^2 .

It is not a de Polignac number, because 421809525 - 2¹ = 421809523 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 421809525.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421809523) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 28299 + ... + 40551.

Almost surely, 2^421809525 is an apocalyptic number.

421809525 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

421809525 is a deficient number, since it is larger than the sum of its proper divisors (405556047).

421809525 is a wasteful number, since it uses less digits than its factorization.

421809525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12292 (or 12278 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 36.

The square root of 421809525 is about 20538.0019719543. The cubic root of 421809525 is about 749.9611979926.

The spelling of 421809525 in words is "four hundred twenty-one million, eight hundred nine thousand, five hundred twenty-five".