427823821 has 2 divisors, whose sum is σ = 427823822. Its totient is φ = 427823820.

The previous prime is 427823761. The next prime is 427823833. The reversal of 427823821 is 128328724.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 219454596 + 208369225 = 14814^2 + 14435^2 .

It is a cyclic number.

It is not a de Polignac number, because 427823821 - 2¹¹ = 427821773 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (427823021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 213911910 + 213911911.

It is an arithmetic number, because the mean of its divisors is an integer number (213911911).

Almost surely, 2^427823821 is an apocalyptic number.

It is an amenable number.

427823821 is a deficient number, since it is larger than the sum of its proper divisors (1).

427823821 is an equidigital number, since it uses as much as digits as its factorization.

427823821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 43008, while the sum is 37.

The square root of 427823821 is about 20683.9024606093. The cubic root of 427823821 is about 753.5087862191.

The spelling of 427823821 in words is "four hundred twenty-seven million, eight hundred twenty-three thousand, eight hundred twenty-one".