123100 has 18 divisors (see below), whose sum is σ = 267344. Its totient is φ = 49200.

The previous prime is 123091. The next prime is 123113. The reversal of 123100 is 1321.

It is a super-2 number, since 2×123100² = 30307220000, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 516 + ... + 715.

2¹²³¹⁰⁰ is an apocalyptic number.

123100 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123100 is an abundant number, since it is smaller than the sum of its proper divisors (144244).

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

123100 is a wasteful number, since it uses less digits than its factorization.

123100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1245 (or 1238 counting only the distinct ones).

The product of its (nonzero) digits is 6, while the sum is 7.

The square root of 123100 is about 350.8560958570. The cubic root of 123100 is about 49.7453721611.

Adding to 123100 its reverse (1321), we get a palindrome (124421).

The spelling of 123100 in words is "one hundred twenty-three thousand, one hundred", and thus it is an iban number.