405525 has 12 divisors (see below), whose sum is σ = 670592. Its totient is φ = 216240.

The previous prime is 405521. The next prime is 405527. The reversal of 405525 is 525504.

It is not a de Polignac number, because 405525 - 2² = 405521 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2629 + ... + 2778.

2⁴⁰⁵⁵²⁵ is an apocalyptic number.

It is an amenable number.

405525 is a deficient number, since it is larger than the sum of its proper divisors (265067).

405525 is a wasteful number, since it uses less digits than its factorization.

405525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5420 (or 5415 counting only the distinct ones).

The product of its (nonzero) digits is 1000, while the sum is 21.

The square root of 405525 is about 636.8084484364. The cubic root of 405525 is about 74.0183178417.

Subtracting from 405525 its sum of digits (21), we obtain a palindrome (405504).

It can be divided in two parts, 40 and 5525, that added together give a triangular number (5565 = T₁₀₅).

The spelling of 405525 in words is "four hundred five thousand, five hundred twenty-five".