421791 has 8 divisors (see below), whose sum is σ = 572160. Its totient is φ = 276312.

The previous prime is 421783. The next prime is 421801. The reversal of 421791 is 197124.

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

It is not a de Polignac number, because 421791 - 2³ = 421783 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421711) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1015 + ... + 1368.

It is an arithmetic number, because the mean of its divisors is an integer number (71520).

2⁴²¹⁷⁹¹ is an apocalyptic number.

421791 is a deficient number, since it is larger than the sum of its proper divisors (150369).

421791 is a wasteful number, since it uses less digits than its factorization.

421791 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2445.

The product of its digits is 504, while the sum is 24.

The square root of 421791 is about 649.4543863891. The cubic root of 421791 is about 74.9950218918.

The spelling of 421791 in words is "four hundred twenty-one thousand, seven hundred ninety-one".