423021605 has 12 divisors (see below), whose sum is σ = 535751532. Its totient is φ = 320604480.

The previous prime is 423021583. The next prime is 423021607. The reversal of 423021605 is 506120324.

It can be written as a sum of positive squares in 2 ways, for example, as 241553764 + 181467841 = 15542^2 + 13471^2 .

It is not a de Polignac number, because 423021605 - 2¹⁶ = 422956069 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423021607) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 115376 + ... + 118985.

It is an arithmetic number, because the mean of its divisors is an integer number (44645961).

Almost surely, 2^423021605 is an apocalyptic number.

It is an amenable number.

423021605 is a deficient number, since it is larger than the sum of its proper divisors (112729927).

423021605 is a wasteful number, since it uses less digits than its factorization.

423021605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234404 (or 234385 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 423021605 is about 20567.4890300202. The cubic root of 423021605 is about 750.6788549855.

Adding to 423021605 its reverse (506120324), we get a palindrome (929141929).

The spelling of 423021605 in words is "four hundred twenty-three million, twenty-one thousand, six hundred five".