122747220 has 108 divisors (see below), whose sum is σ = 393169140. Its totient is φ = 30993408.

The previous prime is 122747173. The next prime is 122747231. The reversal of 122747220 is 22747221.

It can be written as a sum of positive squares in 2 ways, for example, as 51581124 + 71166096 = 7182^2 + 8436^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 64036 + ... + 65924.

It is an arithmetic number, because the mean of its divisors is an integer number (3640455).

Almost surely, 2^122747220 is an apocalyptic number.

122747220 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 122747220, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (196584570).

122747220 is an abundant number, since it is smaller than the sum of its proper divisors (270421920).

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

122747220 is a wasteful number, since it uses less digits than its factorization.

122747220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1942 (or 1918 counting only the distinct ones).

The product of its (nonzero) digits is 3136, while the sum is 27.

The square root of 122747220 is about 11079.1344427261. The cubic root of 122747220 is about 496.9780659580.

Subtracting from 122747220 its reverse (22747221), we obtain a palindrome (99999999).

The spelling of 122747220 in words is "one hundred twenty-two million, seven hundred forty-seven thousand, two hundred twenty".