405791 has 4 divisors (see below), whose sum is σ = 415272. Its totient is φ = 396312.

The previous prime is 405781. The next prime is 405799. The reversal of 405791 is 197504.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-405791 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 405791.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405799) 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, 4676 + ... + 4761.

It is an arithmetic number, because the mean of its divisors is an integer number (103818).

2⁴⁰⁵⁷⁹¹ is an apocalyptic number.

405791 is the 341-st centered heptagonal number.

405791 is a deficient number, since it is larger than the sum of its proper divisors (9481).

405791 is an equidigital number, since it uses as much as digits as its factorization.

405791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9480.

The product of its (nonzero) digits is 1260, while the sum is 26.

The square root of 405791 is about 637.0172682118. The cubic root of 405791 is about 74.0344981587.

The spelling of 405791 in words is "four hundred five thousand, seven hundred ninety-one".