123478900 has 18 divisors (see below), whose sum is σ = 267949430. Its totient is φ = 49391520.

The previous prime is 123478889. The next prime is 123478907. The reversal of 123478900 is 9874321.

It can be written as a sum of positive squares in 3 ways, for example, as 8088336 + 115390564 = 2844^2 + 10742^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123478907) 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, 617295 + ... + 617494.

Almost surely, 2^123478900 is an apocalyptic number.

123478900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

123478900 is an abundant number, since it is smaller than the sum of its proper divisors (144470530).

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

123478900 is a wasteful number, since it uses less digits than its factorization.

123478900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1234803 (or 1234796 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 123478900 is about 11112.1060110134. The cubic root of 123478900 is about 497.9635839460.

The spelling of 123478900 in words is "one hundred twenty-three million, four hundred seventy-eight thousand, nine hundred".