123778122 has 80 divisors (see below), whose sum is σ = 298169760. Its totient is φ = 33958656.

The previous prime is 123778097. The next prime is 123778129. The reversal of 123778122 is 221877321.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (123778129) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 6514629 + ... + 6514647.

It is an arithmetic number, because the mean of its divisors is an integer number (3727122).

Almost surely, 2^123778122 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 123778122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149084880).

123778122 is an abundant number, since it is smaller than the sum of its proper divisors (174391638).

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

123778122 is an equidigital number, since it uses as much as digits as its factorization.

123778122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 105 (or 54 counting only the distinct ones).

The product of its digits is 9408, while the sum is 33.

The square root of 123778122 is about 11125.5616487439. The cubic root of 123778122 is about 498.3654919224.

The spelling of 123778122 in words is "one hundred twenty-three million, seven hundred seventy-eight thousand, one hundred twenty-two".