405690 has 16 divisors (see below), whose sum is σ = 973728. Its totient is φ = 108176.

The previous prime is 405689. The next prime is 405701. The reversal of 405690 is 96504.

It is a super-2 number, since 2×405690² = 329168752200, which contains 22 as substring.

It is a Smith number, since the sum of its digits (24) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a plaindrome in base 11.

It is a self number, because there is not a number n which added to its sum of digits gives 405690.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6732 + ... + 6791.

It is an arithmetic number, because the mean of its divisors is an integer number (60858).

2⁴⁰⁵⁶⁹⁰ is an apocalyptic number.

405690 is an abundant number, since it is smaller than the sum of its proper divisors (568038).

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

405690 is a wasteful number, since it uses less digits than its factorization.

405690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13533.

The product of its (nonzero) digits is 1080, while the sum is 24.

The square root of 405690 is about 636.9379875624. The cubic root of 405690 is about 74.0283553374.

The spelling of 405690 in words is "four hundred five thousand, six hundred ninety".