423435421 has 2 divisors, whose sum is σ = 423435422. Its totient is φ = 423435420.

The previous prime is 423435407. The next prime is 423435431. The reversal of 423435421 is 124534324.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 413105625 + 10329796 = 20325^2 + 3214^2 .

It is a cyclic number.

It is not a de Polignac number, because 423435421 - 2⁹ = 423434909 is a prime.

It is a Chen prime.

It is equal to p_22517551 and since 423435421 and 22517551 have the same sum of digits, it is a Honaker prime.

It is a self number, because there is not a number n which added to its sum of digits gives 423435421.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (423435431) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211717710 + 211717711.

It is an arithmetic number, because the mean of its divisors is an integer number (211717711).

Almost surely, 2^423435421 is an apocalyptic number.

It is an amenable number.

423435421 is a deficient number, since it is larger than the sum of its proper divisors (1).

423435421 is an equidigital number, since it uses as much as digits as its factorization.

423435421 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11520, while the sum is 28.

The square root of 423435421 is about 20577.5465252785. The cubic root of 423435421 is about 750.9235561844.

Adding to 423435421 its reverse (124534324), we get a palindrome (547969745).

The spelling of 423435421 in words is "four hundred twenty-three million, four hundred thirty-five thousand, four hundred twenty-one".