123433520 has 80 divisors (see below), whose sum is σ = 329764608. Its totient is φ = 42090240.

The previous prime is 123433511. The next prime is 123433547. The reversal of 123433520 is 25334321.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 126635 + ... + 127605.

Almost surely, 2^123433520 is an apocalyptic number.

123433520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123433520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (164882304).

123433520 is an abundant number, since it is smaller than the sum of its proper divisors (206331088).

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

123433520 is a wasteful number, since it uses less digits than its factorization.

123433520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1218 (or 1212 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 23.

The square root of 123433520 is about 11110.0639062068. The cubic root of 123433520 is about 497.9025739102.

Adding to 123433520 its reverse (25334321), we get a palindrome (148767841).

The spelling of 123433520 in words is "one hundred twenty-three million, four hundred thirty-three thousand, five hundred twenty".