420500403 has 10 divisors (see below), whose sum is σ = 628155044. Its totient is φ = 280333548.

The previous prime is 420500393. The next prime is 420500413. The reversal of 420500403 is 304005024.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (420500393) and next prime (420500413).

It is not a de Polignac number, because 420500403 - 2⁵ = 420500371 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (420500413) 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 9 ways as a sum of consecutive naturals, for example, 2595601 + ... + 2595762.

Almost surely, 2^420500403 is an apocalyptic number.

420500403 is a deficient number, since it is larger than the sum of its proper divisors (207654641).

420500403 is an equidigital number, since it uses as much as digits as its factorization.

420500403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5191375 (or 5191366 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 420500403 is about 20506.1064807535. The cubic root of 420500403 is about 749.1845376830.

Adding to 420500403 its reverse (304005024), we get a palindrome (724505427).

It can be divided in two parts, 420500 and 403, that added together give a triangular number (420903 = T₉₁₇).

The spelling of 420500403 in words is "four hundred twenty million, five hundred thousand, four hundred three".