122939205172 has 48 divisors (see below), whose sum is σ = 254354300928. Its totient is φ = 50879259360.

The previous prime is 122939205161. The next prime is 122939205199. The reversal of 122939205172 is 271502939221.

It is a happy number.

It is a super-2 number, since 2×122939205172² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 253713 + ... + 556999.

It is an arithmetic number, because the mean of its divisors is an integer number (5299047936).

Almost surely, 2^122939205172 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 122939205172, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (127177150464).

122939205172 is an abundant number, since it is smaller than the sum of its proper divisors (131415095756).

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

122939205172 is a wasteful number, since it uses less digits than its factorization.

122939205172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 303796 (or 303794 counting only the distinct ones).

The product of its (nonzero) digits is 136080, while the sum is 43.

The spelling of 122939205172 in words is "one hundred twenty-two billion, nine hundred thirty-nine million, two hundred five thousand, one hundred seventy-two".