122918940 has 72 divisors (see below), whose sum is σ = 381549168. Its totient is φ = 32014080.

The previous prime is 122918927. The next prime is 122918941. The reversal of 122918940 is 49819221.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 122918895 and 122918904.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (122918941) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 201 + ... + 15680.

It is an arithmetic number, because the mean of its divisors is an integer number (5299294).

Almost surely, 2^122918940 is an apocalyptic number.

122918940 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 122918940, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (190774584).

122918940 is an abundant number, since it is smaller than the sum of its proper divisors (258630228).

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

122918940 is a wasteful number, since it uses less digits than its factorization.

122918940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15939 (or 15934 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 36.

The square root of 122918940 is about 11086.8814370859. The cubic root of 122918940 is about 497.2097108724.

The spelling of 122918940 in words is "one hundred twenty-two million, nine hundred eighteen thousand, nine hundred forty".