423858917 has 2 divisors, whose sum is σ = 423858918. Its totient is φ = 423858916.

The previous prime is 423858913. The next prime is 423858971. The reversal of 423858917 is 719858324.

It is a happy number.

Together with next prime (423858971) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 273207841 + 150651076 = 16529^2 + 12274^2 .

It is a cyclic number.

It is not a de Polignac number, because 423858917 - 2² = 423858913 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (423858913) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 211929458 + 211929459.

It is an arithmetic number, because the mean of its divisors is an integer number (211929459).

Almost surely, 2^423858917 is an apocalyptic number.

It is an amenable number.

423858917 is a deficient number, since it is larger than the sum of its proper divisors (1).

423858917 is an equidigital number, since it uses as much as digits as its factorization.

423858917 is an evil number, because the sum of its binary digits is even.

The product of its digits is 483840, while the sum is 47.

The square root of 423858917 is about 20587.8341988661. The cubic root of 423858917 is about 751.1738164334.

The spelling of 423858917 in words is "four hundred twenty-three million, eight hundred fifty-eight thousand, nine hundred seventeen".