123400000 has 84 divisors (see below), whose sum is σ = 306566316. Its totient is φ = 49280000.

The previous prime is 123399989. The next prime is 123400021. The reversal of 123400000 is 4321.

It can be written as a sum of positive squares in 6 ways, for example, as 121528576 + 1871424 = 11024^2 + 1368^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 123400000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 199692 + ... + 200308.

It is an arithmetic number, because the mean of its divisors is an integer number (3649599).

Almost surely, 2^123400000 is an apocalyptic number.

123400000 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 123400000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (153283158).

123400000 is an abundant number, since it is smaller than the sum of its proper divisors (183166316).

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

123400000 is an frugal number, since it uses more digits than its factorization.

123400000 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 654 (or 624 counting only the distinct ones).

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

The square root of 123400000 is about 11108.5552615991. Note that the first 3 decimals coincide. The cubic root of 123400000 is about 497.8574991600.

Adding to 123400000 its reverse (4321), we get a palindrome (123404321).

The spelling of 123400000 in words is "one hundred twenty-three million, four hundred thousand".