423990851 has 2 divisors, whose sum is σ = 423990852. Its totient is φ = 423990850.

The previous prime is 423990823. The next prime is 423990857. The reversal of 423990851 is 158099324.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 423990851 - 2¹⁰ = 423989827 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 423990799 and 423990808.

It is not a weakly prime, because it can be changed into another prime (423990857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211995425 + 211995426.

It is an arithmetic number, because the mean of its divisors is an integer number (211995426).

Almost surely, 2^423990851 is an apocalyptic number.

423990851 is a deficient number, since it is larger than the sum of its proper divisors (1).

423990851 is an equidigital number, since it uses as much as digits as its factorization.

423990851 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 77760, while the sum is 41.

The square root of 423990851 is about 20591.0381234167. The cubic root of 423990851 is about 751.2517473056.

The spelling of 423990851 in words is "four hundred twenty-three million, nine hundred ninety thousand, eight hundred fifty-one".