423990823 has 2 divisors, whose sum is σ = 423990824. Its totient is φ = 423990822.

The previous prime is 423990781. The next prime is 423990851. The reversal of 423990823 is 328099324.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 423990823 - 2²¹ = 421893671 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (423990023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211995411 + 211995412.

It is an arithmetic number, because the mean of its divisors is an integer number (211995412).

Almost surely, 2^423990823 is an apocalyptic number.

423990823 is a deficient number, since it is larger than the sum of its proper divisors (1).

423990823 is an equidigital number, since it uses as much as digits as its factorization.

423990823 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 40.

The square root of 423990823 is about 20591.0374435093. The cubic root of 423990823 is about 751.2517307683.

The spelling of 423990823 in words is "four hundred twenty-three million, nine hundred ninety thousand, eight hundred twenty-three".