406642 has 4 divisors (see below), whose sum is σ = 609966. Its totient is φ = 203320.

The previous prime is 406633. The next prime is 406649. The reversal of 406642 is 246604.

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., 303601 + 103041 = 551^2 + 321^2 .

It is not an unprimeable number, because it can be changed into a prime (406649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 101659 + ... + 101662.

2⁴⁰⁶⁶⁴² is an apocalyptic number.

406642 is a deficient number, since it is larger than the sum of its proper divisors (203324).

406642 is a wasteful number, since it uses less digits than its factorization.

406642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203323.

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 406642 is about 637.6848751539. The cubic root of 406642 is about 74.0862155592.

The spelling of 406642 in words is "four hundred six thousand, six hundred forty-two".