122985918 has 64 divisors (see below), whose sum is σ = 299946240. Its totient is φ = 37044000.

The previous prime is 122985893. The next prime is 122985931. The reversal of 122985918 is 819589221.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 116493 + ... + 117543.

It is an arithmetic number, because the mean of its divisors is an integer number (4686660).

Almost surely, 2^122985918 is an apocalyptic number.

122985918 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 122985918, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (149973120).

122985918 is an abundant number, since it is smaller than the sum of its proper divisors (176960322).

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

122985918 is a wasteful number, since it uses less digits than its factorization.

122985918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1270 (or 1264 counting only the distinct ones).

The product of its digits is 103680, while the sum is 45.

The square root of 122985918 is about 11089.9016226475. The cubic root of 122985918 is about 497.3000036163.

The spelling of 122985918 in words is "one hundred twenty-two million, nine hundred eighty-five thousand, nine hundred eighteen".