421766 has 8 divisors (see below), whose sum is σ = 636120. Its totient is φ = 209728.

The previous prime is 421741. The next prime is 421783. The reversal of 421766 is 667124.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is an unprimeable number.

421766 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11 + ... + 918.

It is an arithmetic number, because the mean of its divisors is an integer number (79515).

2⁴²¹⁷⁶⁶ is an apocalyptic number.

421766 is a deficient number, since it is larger than the sum of its proper divisors (214354).

421766 is a wasteful number, since it uses less digits than its factorization.

421766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1158.

The product of its digits is 2016, while the sum is 26.

The square root of 421766 is about 649.4351391787. The cubic root of 421766 is about 74.9935401844.

The spelling of 421766 in words is "four hundred twenty-one thousand, seven hundred sixty-six".