405617 has 4 divisors (see below), whose sum is σ = 406896. Its totient is φ = 404340.

The previous prime is 405611. The next prime is 405641. The reversal of 405617 is 716504.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 405617 - 2⁶ = 405553 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 405592 and 405601.

It is not an unprimeable number, because it can be changed into a prime (405611) 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, 242 + ... + 932.

It is an arithmetic number, because the mean of its divisors is an integer number (101724).

2⁴⁰⁵⁶¹⁷ is an apocalyptic number.

It is an amenable number.

405617 is a deficient number, since it is larger than the sum of its proper divisors (1279).

405617 is an equidigital number, since it uses as much as digits as its factorization.

405617 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1278.

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 405617 is about 636.8806795625. The cubic root of 405617 is about 74.0239148417.

The spelling of 405617 in words is "four hundred five thousand, six hundred seventeen".