123817122 has 72 divisors (see below), whose sum is σ = 317631132. Its totient is φ = 34626240.

The previous prime is 123817097. The next prime is 123817123. The reversal of 123817122 is 221718321.

It can be written as a sum of positive squares in 2 ways, for example, as 120758121 + 3059001 = 10989^2 + 1749^2 .

It is not an unprimeable number, because it can be changed into a prime (123817123) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 26128 + ... + 30500.

Almost surely, 2^123817122 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123817122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (158815566).

123817122 is an abundant number, since it is smaller than the sum of its proper divisors (193814010).

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

123817122 is a wasteful number, since it uses less digits than its factorization.

123817122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4416 (or 4402 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 123817122 is about 11127.3142312060. The cubic root of 123817122 is about 498.4178280782.

It can be divided in two parts, 12381 and 7122, that added together give a triangular number (19503 = T₁₉₇).

The spelling of 123817122 in words is "one hundred twenty-three million, eight hundred seventeen thousand, one hundred twenty-two".