423403289 has 2 divisors, whose sum is σ = 423403290. Its totient is φ = 423403288.

The previous prime is 423403249. The next prime is 423403291. The reversal of 423403289 is 982304324.

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., 387499225 + 35904064 = 19685^2 + 5992^2 .

It is a cyclic number.

It is not a de Polignac number, because 423403289 - 2²⁸ = 154967833 is a prime.

Together with 423403291, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (423403229) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211701644 + 211701645.

It is an arithmetic number, because the mean of its divisors is an integer number (211701645).

Almost surely, 2^423403289 is an apocalyptic number.

It is an amenable number.

423403289 is a deficient number, since it is larger than the sum of its proper divisors (1).

423403289 is an equidigital number, since it uses as much as digits as its factorization.

423403289 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 41472, while the sum is 35.

The square root of 423403289 is about 20576.7657565517. The cubic root of 423403289 is about 750.9045613272.

The spelling of 423403289 in words is "four hundred twenty-three million, four hundred three thousand, two hundred eighty-nine".