423240989 has 2 divisors, whose sum is σ = 423240990. Its totient is φ = 423240988.

The previous prime is 423240967. The next prime is 423241001. The reversal of 423240989 is 989042324.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 409860025 + 13380964 = 20245^2 + 3658^2 .

It is a cyclic number.

It is not a de Polignac number, because 423240989 - 2²⁰ = 422192413 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (423240919) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211620494 + 211620495.

It is an arithmetic number, because the mean of its divisors is an integer number (211620495).

Almost surely, 2^423240989 is an apocalyptic number.

It is an amenable number.

423240989 is a deficient number, since it is larger than the sum of its proper divisors (1).

423240989 is an equidigital number, since it uses as much as digits as its factorization.

423240989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 124416, while the sum is 41.

The square root of 423240989 is about 20572.8216100758. The cubic root of 423240989 is about 750.8086028649.

The spelling of 423240989 in words is "four hundred twenty-three million, two hundred forty thousand, nine hundred eighty-nine".