123540400 has 30 divisors (see below), whose sum is σ = 296806772. Its totient is φ = 49416000.

The previous prime is 123540397. The next prime is 123540401. The reversal of 123540400 is 4045321.

It is not an unprimeable number, because it can be changed into a prime (123540401) 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, 154026 + ... + 154825.

Almost surely, 2^123540400 is an apocalyptic number.

123540400 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123540400 is an abundant number, since it is smaller than the sum of its proper divisors (173266372).

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

123540400 is a wasteful number, since it uses less digits than its factorization.

123540400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 308869 (or 308858 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 123540400 is about 11114.8729187517. The cubic root of 123540400 is about 498.0462422719.

Adding to 123540400 its reverse (4045321), we get a palindrome (127585721).

The spelling of 123540400 in words is "one hundred twenty-three million, five hundred forty thousand, four hundred".