123421504 has 56 divisors (see below), whose sum is σ = 251825760. Its totient is φ = 59997696.

The previous prime is 123421499. The next prime is 123421523. The reversal of 123421504 is 405124321.

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, 458682 + ... + 458950.

Almost surely, 2^123421504 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 123421504, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125912880).

123421504 is an abundant number, since it is smaller than the sum of its proper divisors (128404256).

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

123421504 is a wasteful number, since it uses less digits than its factorization.

123421504 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 455 (or 445 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 123421504 is about 11109.5231220786. The cubic root of 123421504 is about 497.8864167878.

Adding to 123421504 its reverse (405124321), we get a palindrome (528545825).

The spelling of 123421504 in words is "one hundred twenty-three million, four hundred twenty-one thousand, five hundred four".