420215403 has 4 divisors (see below), whose sum is σ = 560287208. Its totient is φ = 280143600.

The previous prime is 420215387. The next prime is 420215431. The reversal of 420215403 is 304512024.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 420215403 - 2⁴ = 420215387 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 420215403.

It is not an unprimeable number, because it can be changed into a prime (420217403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70035898 + ... + 70035903.

It is an arithmetic number, because the mean of its divisors is an integer number (140071802).

Almost surely, 2^420215403 is an apocalyptic number.

420215403 is a deficient number, since it is larger than the sum of its proper divisors (140071805).

420215403 is a wasteful number, since it uses less digits than its factorization.

420215403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140071804.

The product of its (nonzero) digits is 960, while the sum is 21.

The square root of 420215403 is about 20499.1561533640. The cubic root of 420215403 is about 749.0152426810.

Adding to 420215403 its reverse (304512024), we get a palindrome (724727427).

The spelling of 420215403 in words is "four hundred twenty million, two hundred fifteen thousand, four hundred three".