123434321520 has 160 divisors (see below), whose sum is σ = 392778574848. Its totient is φ = 32051375104.

The previous prime is 123434321489. The next prime is 123434321611. The reversal of 123434321520 is 25123434321.

It is a super-2 number, since 2×123434321520² (a number of 23 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2194387 + ... + 2249933.

Almost surely, 2^123434321520 is an apocalyptic number.

123434321520 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 123434321520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (196389287424).

123434321520 is an abundant number, since it is smaller than the sum of its proper divisors (269344253328).

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

123434321520 is a wasteful number, since it uses less digits than its factorization.

123434321520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55807 (or 55801 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 30.

Adding to 123434321520 its reverse (25123434321), we get a palindrome (148557755841).

The spelling of 123434321520 in words is "one hundred twenty-three billion, four hundred thirty-four million, three hundred twenty-one thousand, five hundred twenty".