123423400 has 96 divisors (see below), whose sum is σ = 313908480. Its totient is φ = 44928000.

The previous prime is 123423397. The next prime is 123423401. The reversal of 123423400 is 4324321.

It is not an unprimeable number, because it can be changed into a prime (123423401) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 104815 + ... + 105985.

It is an arithmetic number, because the mean of its divisors is an integer number (3269880).

Almost surely, 2^123423400 is an apocalyptic number.

123423400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123423400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (156954240).

123423400 is an abundant number, since it is smaller than the sum of its proper divisors (190485080).

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

123423400 is a wasteful number, since it uses less digits than its factorization.

123423400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1235 (or 1226 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 19.

The square root of 123423400 is about 11109.6084539465. The cubic root of 123423400 is about 497.8889662836. Note that the first 3 decimals are identical.

Adding to 123423400 its reverse (4324321), we get a palindrome (127747721).

The spelling of 123423400 in words is "one hundred twenty-three million, four hundred twenty-three thousand, four hundred".