421759 has 4 divisors (see below), whose sum is σ = 454216. Its totient is φ = 389304.

The previous prime is 421741. The next prime is 421783. The reversal of 421759 is 957124.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 421759 - 2⁵ = 421727 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421709) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16209 + ... + 16234.

It is an arithmetic number, because the mean of its divisors is an integer number (113554).

2⁴²¹⁷⁵⁹ is an apocalyptic number.

421759 is a deficient number, since it is larger than the sum of its proper divisors (32457).

421759 is a wasteful number, since it uses less digits than its factorization.

421759 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 32456.

The product of its digits is 2520, while the sum is 28.

The square root of 421759 is about 649.4297498575. The cubic root of 421759 is about 74.9931252958.

The spelling of 421759 in words is "four hundred twenty-one thousand, seven hundred fifty-nine".