420642403 has 2 divisors, whose sum is σ = 420642404. Its totient is φ = 420642402.

The previous prime is 420642401. The next prime is 420642457. The reversal of 420642403 is 304246024.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 420642403 - 2¹ = 420642401 is a prime.

It is a super-2 number, since 2×420642403² = 353880062403228818, which contains 22 as substring.

Together with 420642401, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (420642401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 210321201 + 210321202.

It is an arithmetic number, because the mean of its divisors is an integer number (210321202).

Almost surely, 2^420642403 is an apocalyptic number.

420642403 is a deficient number, since it is larger than the sum of its proper divisors (1).

420642403 is an equidigital number, since it uses as much as digits as its factorization.

420642403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 25.

The square root of 420642403 is about 20509.5685717667. The cubic root of 420642403 is about 749.2688596248.

Adding to 420642403 its reverse (304246024), we get a palindrome (724888427).

The spelling of 420642403 in words is "four hundred twenty million, six hundred forty-two thousand, four hundred three".