405841 has 4 divisors (see below), whose sum is σ = 429732. Its totient is φ = 381952.

The previous prime is 405829. The next prime is 405857. The reversal of 405841 is 148504.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 176400 + 229441 = 420^2 + 479^2 .

It is a cyclic number.

It is not a de Polignac number, because 405841 - 2¹⁵ = 373073 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (405871) 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, 11920 + ... + 11953.

It is an arithmetic number, because the mean of its divisors is an integer number (107433).

2⁴⁰⁵⁸⁴¹ is an apocalyptic number.

It is an amenable number.

405841 is a deficient number, since it is larger than the sum of its proper divisors (23891).

405841 is a wasteful number, since it uses less digits than its factorization.

405841 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23890.

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

The square root of 405841 is about 637.0565124069. The cubic root of 405841 is about 74.0375387822.

The spelling of 405841 in words is "four hundred five thousand, eight hundred forty-one".