123402144 has 48 divisors (see below), whose sum is σ = 324505440. Its totient is φ = 41061120.

The previous prime is 123402127. The next prime is 123402173. The reversal of 123402144 is 441204321.

It is a tau number, because it is divible by the number of its divisors (48).

It is a self number, because there is not a number n which added to its sum of digits gives 123402144.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 97387 + ... + 98645.

It is an arithmetic number, because the mean of its divisors is an integer number (6760530).

Almost surely, 2^123402144 is an apocalyptic number.

It is an amenable number.

123402144 is an abundant number, since it is smaller than the sum of its proper divisors (201103296).

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

123402144 is a wasteful number, since it uses less digits than its factorization.

123402144 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2293 (or 2285 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 123402144 is about 11108.6517633779. The cubic root of 123402144 is about 497.8603824671.

Adding to 123402144 its reverse (441204321), we get a palindrome (564606465).

The spelling of 123402144 in words is "one hundred twenty-three million, four hundred two thousand, one hundred forty-four".