123121504 has 48 divisors (see below), whose sum is σ = 265655376. Its totient is φ = 55705600.

The previous prime is 123121477. The next prime is 123121511. The reversal of 123121504 is 405121321.

It is a congruent number.

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, 89784 + ... + 91144.

It is an arithmetic number, because the mean of its divisors is an integer number (5534487).

Almost surely, 2^123121504 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123121504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (132827688).

123121504 is an abundant number, since it is smaller than the sum of its proper divisors (142533872).

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

123121504 is a wasteful number, since it uses less digits than its factorization.

123121504 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1639 (or 1631 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 19.

The square root of 123121504 is about 11096.0129776420. The cubic root of 123121504 is about 497.4826861983.

Adding to 123121504 its reverse (405121321), we get a palindrome (528242825).

The spelling of 123121504 in words is "one hundred twenty-three million, one hundred twenty-one thousand, five hundred four".