421917 has 4 divisors (see below), whose sum is σ = 562560. Its totient is φ = 281276.

The previous prime is 421913. The next prime is 421943. The reversal of 421917 is 719124.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 421917 - 2² = 421913 is a prime.

It is a D-number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (421913) 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, 70317 + ... + 70322.

It is an arithmetic number, because the mean of its divisors is an integer number (140640).

2⁴²¹⁹¹⁷ is an apocalyptic number.

It is an amenable number.

421917 is a deficient number, since it is larger than the sum of its proper divisors (140643).

421917 is a wasteful number, since it uses less digits than its factorization.

421917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140642.

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

The square root of 421917 is about 649.5513836487. The cubic root of 421917 is about 75.0024888063.

The spelling of 421917 in words is "four hundred twenty-one thousand, nine hundred seventeen".