123423638 has 32 divisors (see below), whose sum is σ = 216838944. Its totient is φ = 52157952.

The previous prime is 123423637. The next prime is 123423647. The reversal of 123423638 is 836324321.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123423637) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12581 + ... + 20127.

It is an arithmetic number, because the mean of its divisors is an integer number (6776217).

Almost surely, 2^123423638 is an apocalyptic number.

123423638 is a deficient number, since it is larger than the sum of its proper divisors (93415306).

123423638 is a wasteful number, since it uses less digits than its factorization.

123423638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7616.

The product of its digits is 20736, while the sum is 32.

The square root of 123423638 is about 11109.6191653900. The cubic root of 123423638 is about 497.8892863134.

Adding to 123423638 its reverse (836324321), we get a palindrome (959747959).

The spelling of 123423638 in words is "one hundred twenty-three million, four hundred twenty-three thousand, six hundred thirty-eight".