122643400 has 96 divisors (see below), whose sum is σ = 314578080. Its totient is φ = 44096000.

The previous prime is 122643317. The next prime is 122643401. The reversal of 122643400 is 4346221.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (22).

It is not an unprimeable number, because it can be changed into a prime (122643401) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 235140 + ... + 235660.

It is an arithmetic number, because the mean of its divisors is an integer number (3276855).

Almost surely, 2^122643400 is an apocalyptic number.

122643400 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 122643400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (157289040).

122643400 is an abundant number, since it is smaller than the sum of its proper divisors (191934680).

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

122643400 is a wasteful number, since it uses less digits than its factorization.

122643400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 655 (or 646 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 122643400 is about 11074.4480675111. The cubic root of 122643400 is about 496.8379112118.

Adding to 122643400 its reverse (4346221), we get a palindrome (126989621).

The spelling of 122643400 in words is "one hundred twenty-two million, six hundred forty-three thousand, four hundred".