423663917 has 4 divisors (see below), whose sum is σ = 423707676. Its totient is φ = 423620160.

The previous prime is 423663913. The next prime is 423663937. The reversal of 423663917 is 719366324.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 137851081 + 285812836 = 11741^2 + 16906^2 .

It is a cyclic number.

It is not a de Polignac number, because 423663917 - 2² = 423663913 is a prime.

It is a super-2 number, since 2×423663917² = 358982229135565778, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (423663913) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 188 + ... + 29109.

It is an arithmetic number, because the mean of its divisors is an integer number (105926919).

Almost surely, 2^423663917 is an apocalyptic number.

It is an amenable number.

423663917 is a deficient number, since it is larger than the sum of its proper divisors (43759).

423663917 is a wasteful number, since it uses less digits than its factorization.

423663917 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43758.

The product of its digits is 163296, while the sum is 41.

The square root of 423663917 is about 20583.0978475059. The cubic root of 423663917 is about 751.0586040699.

The spelling of 423663917 in words is "four hundred twenty-three million, six hundred sixty-three thousand, nine hundred seventeen".