423544403 has 2 divisors, whose sum is σ = 423544404. Its totient is φ = 423544402.

The previous prime is 423544361. The next prime is 423544441. The reversal of 423544403 is 304445324.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 423544403 - 2⁶ = 423544339 is a prime.

It is a super-2 number, since 2×423544403² = 358779722625252818, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (423544463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211772201 + 211772202.

It is an arithmetic number, because the mean of its divisors is an integer number (211772202).

Almost surely, 2^423544403 is an apocalyptic number.

423544403 is a deficient number, since it is larger than the sum of its proper divisors (1).

423544403 is an equidigital number, since it uses as much as digits as its factorization.

423544403 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 23040, while the sum is 29.

The square root of 423544403 is about 20580.1944354275. The cubic root of 423544403 is about 750.9879738240.

Adding to 423544403 its reverse (304445324), we get a palindrome (727989727).

The spelling of 423544403 in words is "four hundred twenty-three million, five hundred forty-four thousand, four hundred three".