123940 has 12 divisors (see below), whose sum is σ = 260316. Its totient is φ = 49568.

The previous prime is 123931. The next prime is 123941. The reversal of 123940 is 49321.

It can be written as a sum of positive squares in 2 ways, for example, as 46656 + 77284 = 216^2 + 278^2 .

It is a super-2 number, since 2×123940² = 30722247200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3079 + ... + 3118.

It is an arithmetic number, because the mean of its divisors is an integer number (21693).

2¹²³⁹⁴⁰ is an apocalyptic number.

123940 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123940 is an abundant number, since it is smaller than the sum of its proper divisors (136376).

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

123940 is a wasteful number, since it uses less digits than its factorization.

123940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6206 (or 6204 counting only the distinct ones).

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 123940 is about 352.0511326498. The cubic root of 123940 is about 49.8582652716.

The spelling of 123940 in words is "one hundred twenty-three thousand, nine hundred forty".