122721792 has 80 divisors (see below), whose sum is σ = 330388080. Its totient is φ = 40476672.

The previous prime is 122721791. The next prime is 122721811. The reversal of 122721792 is 297127221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122721791) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 167058 + ... + 167790.

It is an arithmetic number, because the mean of its divisors is an integer number (4129851).

Almost surely, 2^122721792 is an apocalyptic number.

122721792 is a gapful number since it is divisible by the number (12) 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 122721792, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (165194040).

122721792 is an abundant number, since it is smaller than the sum of its proper divisors (207666288).

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

122721792 is an equidigital number, since it uses as much as digits as its factorization.

122721792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 863 (or 847 counting only the distinct ones).

The product of its digits is 7056, while the sum is 33.

The square root of 122721792 is about 11077.9868207179. The cubic root of 122721792 is about 496.9437460199.

The spelling of 122721792 in words is "one hundred twenty-two million, seven hundred twenty-one thousand, seven hundred ninety-two".