420256917 has 20 divisors (see below), whose sum is σ = 628461900. Its totient is φ = 279872064.

The previous prime is 420256913. The next prime is 420256927. The reversal of 420256917 is 719652024.

It can be written as a sum of positive squares in 2 ways, for example, as 87778161 + 332478756 = 9369^2 + 18234^2 .

It is not a de Polignac number, because 420256917 - 2² = 420256913 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420256913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 94459 + ... + 98807.

It is an arithmetic number, because the mean of its divisors is an integer number (31423095).

Almost surely, 2^420256917 is an apocalyptic number.

It is an amenable number.

420256917 is a deficient number, since it is larger than the sum of its proper divisors (208204983).

420256917 is a wasteful number, since it uses less digits than its factorization.

420256917 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5554 (or 5545 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 420256917 is about 20500.1687066229. The cubic root of 420256917 is about 749.0399074876.

The spelling of 420256917 in words is "four hundred twenty million, two hundred fifty-six thousand, nine hundred seventeen".