123939816 has 288 divisors, whose sum is σ = 433026720. Its totient is φ = 29272320.

The previous prime is 123939791. The next prime is 123939817. The reversal of 123939816 is 618939321.

It is a super-2 number, since 2×123939816² = 30722155980227712, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123939817) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1849815 + ... + 1849881.

It is an arithmetic number, because the mean of its divisors is an integer number (1503565).

Almost surely, 2^123939816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123939816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (216513360).

123939816 is an abundant number, since it is smaller than the sum of its proper divisors (309086904).

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

123939816 is a wasteful number, since it uses less digits than its factorization.

123939816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 125 (or 103 counting only the distinct ones).

The product of its digits is 69984, while the sum is 42.

The square root of 123939816 is about 11132.8260563075. The cubic root of 123939816 is about 498.5824059861.

It can be divided in two parts, 123 and 939816, that added together give a palindrome (939939).

The spelling of 123939816 in words is "one hundred twenty-three million, nine hundred thirty-nine thousand, eight hundred sixteen".