421790 has 8 divisors (see below), whose sum is σ = 759240. Its totient is φ = 168712.

The previous prime is 421783. The next prime is 421801. The reversal of 421790 is 97124.

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

It is a congruent number.

It is an unprimeable number.

421790 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 (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21080 + ... + 21099.

It is an arithmetic number, because the mean of its divisors is an integer number (94905).

2⁴²¹⁷⁹⁰ is an apocalyptic number.

421790 is a deficient number, since it is larger than the sum of its proper divisors (337450).

421790 is a wasteful number, since it uses less digits than its factorization.

421790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42186.

The product of its (nonzero) digits is 504, while the sum is 23.

The square root of 421790 is about 649.4536165116. The cubic root of 421790 is about 74.9949626246.

The spelling of 421790 in words is "four hundred twenty-one thousand, seven hundred ninety".