123980 has 12 divisors (see below), whose sum is σ = 260400. Its totient is φ = 49584.

The previous prime is 123979. The next prime is 123983. The reversal of 123980 is 89321.

123980 = T₁₂₁ + T₁₂₂ + ... + T₁₃₅.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123983) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3080 + ... + 3119.

It is an arithmetic number, because the mean of its divisors is an integer number (21700).

2¹²³⁹⁸⁰ is an apocalyptic number.

123980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123980 is an abundant number, since it is smaller than the sum of its proper divisors (136420).

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

123980 is a wasteful number, since it uses less digits than its factorization.

123980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6208 (or 6206 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 123980 is about 352.1079379963. The cubic root of 123980 is about 49.8636283939.

The spelling of 123980 in words is "one hundred twenty-three thousand, nine hundred eighty".