423565823 has 2 divisors, whose sum is σ = 423565824. Its totient is φ = 423565822.

The previous prime is 423565819. The next prime is 423565859. The reversal of 423565823 is 328565324.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 423565823 - 2² = 423565819 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (423565123) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211782911 + 211782912.

It is an arithmetic number, because the mean of its divisors is an integer number (211782912).

Almost surely, 2^423565823 is an apocalyptic number.

423565823 is a deficient number, since it is larger than the sum of its proper divisors (1).

423565823 is an equidigital number, since it uses as much as digits as its factorization.

423565823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 172800, while the sum is 38.

The square root of 423565823 is about 20580.7148320946. The cubic root of 423565823 is about 751.0006335681. Note that the first 3 decimals are identical.

The spelling of 423565823 in words is "four hundred twenty-three million, five hundred sixty-five thousand, eight hundred twenty-three".