18910122 has 72 divisors (see below), whose sum is σ = 48301344. Its totient is φ = 4831200.

The previous prime is 18910091. The next prime is 18910123. The reversal of 18910122 is 22101981.

It is a junction number, because it is equal to n+sod(n) for n = 18910092 and 18910101.

It is not an unprimeable number, because it can be changed into a prime (18910123) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 309972 + ... + 310032.

It is an arithmetic number, because the mean of its divisors is an integer number (670852).

Almost surely, 2^18910122 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18910122, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24150672).

18910122 is an abundant number, since it is smaller than the sum of its proper divisors (29391222).

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

18910122 is a wasteful number, since it uses less digits than its factorization.

18910122 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156 (or 84 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 24.

The square root of 18910122 is about 4348.5770086317. The cubic root of 18910122 is about 266.4187442285.

The spelling of 18910122 in words is "eighteen million, nine hundred ten thousand, one hundred twenty-two".