420440403 has 4 divisors (see below), whose sum is σ = 560587208. Its totient is φ = 280293600.

The previous prime is 420440393. The next prime is 420440411. The reversal of 420440403 is 304044024.

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

It is not a de Polignac number, because 420440403 - 2⁴ = 420440387 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 420440403.

It is not an unprimeable number, because it can be changed into a prime (420440473) 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, 70073398 + ... + 70073403.

It is an arithmetic number, because the mean of its divisors is an integer number (140146802).

Almost surely, 2^420440403 is an apocalyptic number.

420440403 is a deficient number, since it is larger than the sum of its proper divisors (140146805).

420440403 is a wasteful number, since it uses less digits than its factorization.

420440403 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 140146804.

The product of its (nonzero) digits is 1536, while the sum is 21.

The square root of 420440403 is about 20504.6434497165. The cubic root of 420440403 is about 749.1489029883.

Adding to 420440403 its reverse (304044024), we get a palindrome (724484427).

The spelling of 420440403 in words is "four hundred twenty million, four hundred forty thousand, four hundred three".