123823638 has 24 divisors (see below), whose sum is σ = 272291448. Its totient is φ = 40658112.

The previous prime is 123823577. The next prime is 123823639. The reversal of 123823638 is 836328321.

123823638 is a `hidden beast` number, since 12 + 3 + 8 + 2 + 3 + 638 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123823639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 50131 + ... + 52542.

It is an arithmetic number, because the mean of its divisors is an integer number (11345477).

Almost surely, 2^123823638 is an apocalyptic number.

123823638 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

123823638 is an abundant number, since it is smaller than the sum of its proper divisors (148467810).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

123823638 is a wasteful number, since it uses less digits than its factorization.

123823638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 102748 (or 102745 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The square root of 123823638 is about 11127.6070203795. The cubic root of 123823638 is about 498.4265711705.

The spelling of 123823638 in words is "one hundred twenty-three million, eight hundred twenty-three thousand, six hundred thirty-eight".