405780 has 24 divisors (see below), whose sum is σ = 1136352. Its totient is φ = 108192.

The previous prime is 405767. The next prime is 405781. The reversal of 405780 is 87504.

It is a self number, because there is not a number n which added to its sum of digits gives 405780.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405781) 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 7 ways as a sum of consecutive naturals, for example, 3322 + ... + 3441.

It is an arithmetic number, because the mean of its divisors is an integer number (47348).

2⁴⁰⁵⁷⁸⁰ is an apocalyptic number.

It is an amenable number.

405780 is an abundant number, since it is smaller than the sum of its proper divisors (730572).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

405780 is a wasteful number, since it uses less digits than its factorization.

405780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6775 (or 6773 counting only the distinct ones).

The product of its (nonzero) digits is 1120, while the sum is 24.

The square root of 405780 is about 637.0086341644. The cubic root of 405780 is about 74.0338291881.

The spelling of 405780 in words is "four hundred five thousand, seven hundred eighty".