405542 has 12 divisors (see below), whose sum is σ = 631548. Its totient is φ = 195300.

The previous prime is 405541. The next prime is 405553. The reversal of 405542 is 245504.

It is a happy number.

It is a congruent number.

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 5 ways as a sum of consecutive naturals, for example, 1817 + ... + 2027.

It is an arithmetic number, because the mean of its divisors is an integer number (52629).

2⁴⁰⁵⁵⁴² is an apocalyptic number.

405542 is a deficient number, since it is larger than the sum of its proper divisors (226006).

405542 is a wasteful number, since it uses less digits than its factorization.

405542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275 (or 244 counting only the distinct ones).

The product of its (nonzero) digits is 800, while the sum is 20.

The square root of 405542 is about 636.8217961094. The cubic root of 405542 is about 74.0193521337.

The spelling of 405542 in words is "four hundred five thousand, five hundred forty-two".