423505917 has 6 divisors (see below), whose sum is σ = 611730782. Its totient is φ = 282337272.

The previous prime is 423505913. The next prime is 423505919. The reversal of 423505917 is 719505324.

It can be written as a sum of positive squares in only one way, i.e., 214153956 + 209351961 = 14634^2 + 14469^2 .

It is not a de Polignac number, because 423505917 - 2² = 423505913 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 (423505913) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 23528098 + ... + 23528115.

Almost surely, 2^423505917 is an apocalyptic number.

It is an amenable number.

423505917 is a deficient number, since it is larger than the sum of its proper divisors (188224865).

423505917 is a wasteful number, since it uses less digits than its factorization.

423505917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47056219 (or 47056216 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 36.

The square root of 423505917 is about 20579.2593890062. The cubic root of 423505917 is about 750.9652265840.

The spelling of 423505917 in words is "four hundred twenty-three million, five hundred five thousand, nine hundred seventeen".