123130 has 16 divisors (see below), whose sum is σ = 253440. Its totient is φ = 42192.
The previous prime is 123127. The next prime is 123143. The reversal of 123130 is 31321.
It is a Harshad number since it is a multiple of its sum of digits (10).
It is an unprimeable number.
It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 810 + ... + 949.
It is an arithmetic number, because the mean of its divisors is an integer number (15840).
2123130 is an apocalyptic number.
123130 is a gapful number since it is divisible by the number (10) formed by its first and last digit.
123130 is an abundant number, since it is smaller than the sum of its proper divisors (130310).
It is a weird number, because it is abundant, but not a pseudoperfect number.
123130 is a wasteful number, since it uses less digits than its factorization.
123130 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 1773.
The product of its (nonzero) digits is 18, while the sum is 10.
The square root of 123130 is about 350.8988458231. The cubic root of 123130 is about 49.7494128867.
Adding to 123130 its reverse (31321), we get a palindrome (154451).
Subtracting from 123130 its reverse (31321), we obtain a square (91809 = 3032).
It can be divided in two parts, 123 and 130, that added together give a triangular number (253 = T22).
The spelling of 123130 in words is "one hundred twenty-three thousand, one hundred thirty".
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