405546 has 16 divisors (see below), whose sum is σ = 817344. Its totient is φ = 134144.

The previous prime is 405541. The next prime is 405553. The reversal of 405546 is 645504.

It is a plaindrome in base 13.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 405546.

It is not an unprimeable number, because it can be changed into a prime (405541) 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, 1411 + ... + 1673.

It is an arithmetic number, because the mean of its divisors is an integer number (51084).

2⁴⁰⁵⁵⁴⁶ is an apocalyptic number.

405546 is an abundant number, since it is smaller than the sum of its proper divisors (411798).

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

405546 is a wasteful number, since it uses less digits than its factorization.

405546 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 525.

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 405546 is about 636.8249366977. The cubic root of 405546 is about 74.0195954923.

The spelling of 405546 in words is "four hundred five thousand, five hundred forty-six".