123423639 has 8 divisors (see below), whose sum is σ = 173226240. Its totient is φ = 77951736.

The previous prime is 123423637. The next prime is 123423647. The reversal of 123423639 is 936324321.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 123423639 - 2¹ = 123423637 is a prime.

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 pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1082607 + ... + 1082720.

It is an arithmetic number, because the mean of its divisors is an integer number (21653280).

Almost surely, 2^123423639 is an apocalyptic number.

123423639 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

123423639 is a deficient number, since it is larger than the sum of its proper divisors (49802601).

123423639 is a wasteful number, since it uses less digits than its factorization.

123423639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2165349.

The product of its digits is 23328, while the sum is 33.

The square root of 123423639 is about 11109.6192103960. The cubic root of 123423639 is about 497.8892876581.

The spelling of 123423639 in words is "one hundred twenty-three million, four hundred twenty-three thousand, six hundred thirty-nine".