406442 has 4 divisors (see below), whose sum is σ = 609666. Its totient is φ = 203220.

The previous prime is 406423. The next prime is 406447. The reversal of 406442 is 244604.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 398161 + 8281 = 631^2 + 91^2 .

It is not an unprimeable number, because it can be changed into a prime (406447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101609 + ... + 101612.

2⁴⁰⁶⁴⁴² is an apocalyptic number.

406442 is a deficient number, since it is larger than the sum of its proper divisors (203224).

406442 is a wasteful number, since it uses less digits than its factorization.

406442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 203223.

The product of its (nonzero) digits is 768, while the sum is 20.

The square root of 406442 is about 637.5280385991. The cubic root of 406442 is about 74.0740675494.

It can be divided in two parts, 406 and 442, that added together give a palindrome (848).

The spelling of 406442 in words is "four hundred six thousand, four hundred forty-two".