123121400 has 24 divisors (see below), whose sum is σ = 286257720. Its totient is φ = 49248480.

The previous prime is 123121399. The next prime is 123121403. The reversal of 123121400 is 4121321.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123121403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 307604 + ... + 308003.

It is an arithmetic number, because the mean of its divisors is an integer number (11927405).

Almost surely, 2^123121400 is an apocalyptic number.

123121400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123121400 is an abundant number, since it is smaller than the sum of its proper divisors (163136320).

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

123121400 is a wasteful number, since it uses less digits than its factorization.

123121400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 615623 (or 615614 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 123121400 is about 11096.0082912730. The cubic root of 123121400 is about 497.4825461247.

Adding to 123121400 its reverse (4121321), we get a palindrome (127242721).

The spelling of 123121400 in words is "one hundred twenty-three million, one hundred twenty-one thousand, four hundred".