427597921 has 2 divisors, whose sum is σ = 427597922. Its totient is φ = 427597920.

The previous prime is 427597903. The next prime is 427597931. The reversal of 427597921 is 129795724.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 404211025 + 23386896 = 20105^2 + 4836^2 .

It is a cyclic number.

It is not a de Polignac number, because 427597921 - 2²⁷ = 293380193 is a prime.

It is not a weakly prime, because it can be changed into another prime (427597901) 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, 213798960 + 213798961.

It is an arithmetic number, because the mean of its divisors is an integer number (213798961).

Almost surely, 2^427597921 is an apocalyptic number.

It is an amenable number.

427597921 is a deficient number, since it is larger than the sum of its proper divisors (1).

427597921 is an equidigital number, since it uses as much as digits as its factorization.

427597921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 317520, while the sum is 46.

The square root of 427597921 is about 20678.4409712144. The cubic root of 427597921 is about 753.3761400263.

The spelling of 427597921 in words is "four hundred twenty-seven million, five hundred ninety-seven thousand, nine hundred twenty-one".