420608717 has 4 divisors (see below), whose sum is σ = 420651996. Its totient is φ = 420565440.

The previous prime is 420608707. The next prime is 420608729. The reversal of 420608717 is 717806024.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 235131556 + 185477161 = 15334^2 + 13619^2 .

It is a cyclic number.

It is not a de Polignac number, because 420608717 - 2²⁴ = 403831501 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 (420608707) 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, 467 + ... + 29007.

It is an arithmetic number, because the mean of its divisors is an integer number (105162999).

Almost surely, 2^420608717 is an apocalyptic number.

It is an amenable number.

420608717 is a deficient number, since it is larger than the sum of its proper divisors (43279).

420608717 is a wasteful number, since it uses less digits than its factorization.

420608717 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43278.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 420608717 is about 20508.7473288838. The cubic root of 420608717 is about 749.2488580396.

The spelling of 420608717 in words is "four hundred twenty million, six hundred eight thousand, seven hundred seventeen".