420431403 has 32 divisors (see below), whose sum is σ = 692803584. Its totient is φ = 221294592.

The previous prime is 420431377. The next prime is 420431419. The reversal of 420431403 is 304134024.

It is not a de Polignac number, because 420431403 - 2⁸ = 420431147 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (21).

It is a self number, because there is not a number n which added to its sum of digits gives 420431403.

It is not an unprimeable number, because it can be changed into a prime (420431423) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4251 + ... + 29307.

It is an arithmetic number, because the mean of its divisors is an integer number (21650112).

Almost surely, 2^420431403 is an apocalyptic number.

420431403 is a deficient number, since it is larger than the sum of its proper divisors (272372181).

420431403 is a wasteful number, since it uses less digits than its factorization.

420431403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25131.

The product of its (nonzero) digits is 1152, while the sum is 21.

The square root of 420431403 is about 20504.4239860573. The cubic root of 420431403 is about 749.1435574917.

Adding to 420431403 its reverse (304134024), we get a palindrome (724565427).

The spelling of 420431403 in words is "four hundred twenty million, four hundred thirty-one thousand, four hundred three".