122778 has 24 divisors (see below), whose sum is σ = 280800. Its totient is φ = 38664.

The previous prime is 122777. The next prime is 122789. The reversal of 122778 is 877221.

It is a plaindrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (122777) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 163 + ... + 521.

It is an arithmetic number, because the mean of its divisors is an integer number (11700).

2¹²²⁷⁷⁸ is an apocalyptic number.

122778 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 122778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (140400).

122778 is an abundant number, since it is smaller than the sum of its proper divisors (158022).

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

122778 is a wasteful number, since it uses less digits than its factorization.

122778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 386 (or 383 counting only the distinct ones).

The product of its digits is 1568, while the sum is 27.

The square root of 122778 is about 350.3969177947. The cubic root of 122778 is about 49.7019603101.

Adding to 122778 its reverse (877221), we get a palindrome (999999).

It can be divided in two parts, 122 and 778, that added together give a square (900 = 30²).

The spelling of 122778 in words is "one hundred twenty-two thousand, seven hundred seventy-eight".