420517 has 4 divisors (see below), whose sum is σ = 425920. Its totient is φ = 415116.

The previous prime is 420503. The next prime is 420521. The reversal of 420517 is 715024.

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 420517 - 2¹⁵ = 387749 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 420494 and 420503.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420557) 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, 2583 + ... + 2740.

It is an arithmetic number, because the mean of its divisors is an integer number (106480).

2⁴²⁰⁵¹⁷ is an apocalyptic number.

It is an amenable number.

420517 is a deficient number, since it is larger than the sum of its proper divisors (5403).

420517 is an equidigital number, since it uses as much as digits as its factorization.

420517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5402.

The product of its (nonzero) digits is 280, while the sum is 19.

The square root of 420517 is about 648.4728213272. The cubic root of 420517 is about 74.9194394235.

The spelling of 420517 in words is "four hundred twenty thousand, five hundred seventeen".