423945263909 has 4 divisors (see below), whose sum is σ = 423951177804. Its totient is φ = 423939350016.

The previous prime is 423945263881. The next prime is 423945263923. The reversal of 423945263909 is 909362549324.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 154309123684 + 269636140225 = 392822^2 + 519265^2 .

It is a cyclic number.

It is not a de Polignac number, because 423945263909 - 2⁸ = 423945263653 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423948263909) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2848082 + ... + 2993235.

It is an arithmetic number, because the mean of its divisors is an integer number (105987794451).

Almost surely, 2^423945263909 is an apocalyptic number.

It is an amenable number.

423945263909 is a deficient number, since it is larger than the sum of its proper divisors (5913895).

423945263909 is an equidigital number, since it uses as much as digits as its factorization.

423945263909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5913894.

The product of its (nonzero) digits is 12597120, while the sum is 56.

The spelling of 423945263909 in words is "four hundred twenty-three billion, nine hundred forty-five million, two hundred sixty-three thousand, nine hundred nine".