123339840 has 112 divisors (see below), whose sum is σ = 421770048. Its totient is φ = 30357504.

The previous prime is 123339829. The next prime is 123339847. The reversal of 123339840 is 48933321.

It is a happy number.

It is a super-2 number, since 2×123339840² = 30425432262451200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (123339847) 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, 7539 + ... + 17421.

It is an arithmetic number, because the mean of its divisors is an integer number (3765804).

Almost surely, 2^123339840 is an apocalyptic number.

123339840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123339840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (210885024).

123339840 is an abundant number, since it is smaller than the sum of its proper divisors (298430208).

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

123339840 is a wasteful number, since it uses less digits than its factorization.

123339840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9916 (or 9906 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 123339840 is about 11105.8471086181. The cubic root of 123339840 is about 497.7765808031.

The spelling of 123339840 in words is "one hundred twenty-three million, three hundred thirty-nine thousand, eight hundred forty".