420245775 has 72 divisors (see below), whose sum is σ = 778163984. Its totient is φ = 216691200.

The previous prime is 420245747. The next prime is 420245779. The reversal of 420245775 is 577542024.

It is a happy number.

It is not a de Polignac number, because 420245775 - 2¹⁵ = 420213007 is a prime.

It is a super-2 number, since 2×420245775² = 353213022810701250, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (420245779) 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 71 ways as a sum of consecutive naturals, for example, 919347 + ... + 919803.

Almost surely, 2^420245775 is an apocalyptic number.

420245775 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

420245775 is a deficient number, since it is larger than the sum of its proper divisors (357918209).

420245775 is a wasteful number, since it uses less digits than its factorization.

420245775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 601 (or 593 counting only the distinct ones).

The product of its (nonzero) digits is 78400, while the sum is 36.

The square root of 420245775 is about 20499.8969509605. The cubic root of 420245775 is about 749.0332878255.

Adding to 420245775 its reverse (577542024), we get a palindrome (997787799).

The spelling of 420245775 in words is "four hundred twenty million, two hundred forty-five thousand, seven hundred seventy-five".