406242 has 16 divisors (see below), whose sum is σ = 902880. Its totient is φ = 135396.

The previous prime is 406207. The next prime is 406247. The reversal of 406242 is 242604.

406242 is a `hidden beast` number, since 40 + 624 + 2 = 666.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 406242.

It is not an unprimeable number, because it can be changed into a prime (406247) by changing a digit.

406242 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3708 + ... + 3815.

It is an arithmetic number, because the mean of its divisors is an integer number (56430).

2⁴⁰⁶²⁴² is an apocalyptic number.

406242 is an abundant number, since it is smaller than the sum of its proper divisors (496638).

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

406242 is a wasteful number, since it uses less digits than its factorization.

406242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7534 (or 7528 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 18.

The square root of 406242 is about 637.3711634519. The cubic root of 406242 is about 74.0619155538.

Adding to 406242 its reverse (242604), we get a palindrome (648846).

The spelling of 406242 in words is "four hundred six thousand, two hundred forty-two".