123400 has 24 divisors (see below), whose sum is σ = 287370. Its totient is φ = 49280.

The previous prime is 123397. The next prime is 123401. The reversal of 123400 is 4321.

It can be written as a sum of positive squares in 3 ways, for example, as 54756 + 68644 = 234^2 + 262^2 .

It is a Harshad number since it is a multiple of its sum of digits (10).

It is not an unprimeable number, because it can be changed into a prime (123401) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 109 + ... + 508.

2¹²³⁴⁰⁰ is an apocalyptic number.

123400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123400 is an abundant number, since it is smaller than the sum of its proper divisors (163970).

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

123400 is a wasteful number, since it uses less digits than its factorization.

123400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 633 (or 624 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 123400 is about 351.2833614050. The cubic root of 123400 is about 49.7857499160.

Adding to 123400 its reverse (4321), we get a palindrome (127721).

The spelling of 123400 in words is "one hundred twenty-three thousand, four hundred", and thus it is an iban number.