405625 has 20 divisors (see below), whose sum is σ = 562320. Its totient is φ = 290000.

The previous prime is 405611. The next prime is 405641. The reversal of 405625 is 526504.

It is not a de Polignac number, because 405625 - 2⁷ = 405497 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 405596 and 405605.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 6846 + ... + 6904.

It is an arithmetic number, because the mean of its divisors is an integer number (28116).

2⁴⁰⁵⁶²⁵ is an apocalyptic number.

It is an amenable number.

405625 is a deficient number, since it is larger than the sum of its proper divisors (156695).

405625 is an equidigital number, since it uses as much as digits as its factorization.

405625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 90 (or 75 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 22.

The square root of 405625 is about 636.8869601428. The cubic root of 405625 is about 74.0244014974.

It can be divided in two parts, 40 and 5625, that added together give a palindrome (5665).

The spelling of 405625 in words is "four hundred five thousand, six hundred twenty-five".