405490 has 32 divisors (see below), whose sum is σ = 798336. Its totient is φ = 147840.

The previous prime is 405487. The next prime is 405491. The reversal of 405490 is 94504.

405490 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (405491) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9409 + ... + 9451.

It is an arithmetic number, because the mean of its divisors is an integer number (24948).

2⁴⁰⁵⁴⁹⁰ is an apocalyptic number.

405490 is a deficient number, since it is larger than the sum of its proper divisors (392846).

405490 is a wasteful number, since it uses less digits than its factorization.

405490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 405490 is about 636.7809670523. The cubic root of 405490 is about 74.0161883259.

Adding to 405490 its reverse (94504), we get a palindrome (499994).

The spelling of 405490 in words is "four hundred five thousand, four hundred ninety".