18200122 has 4 divisors (see below), whose sum is σ = 27300186. Its totient is φ = 9100060.

The previous prime is 18200113. The next prime is 18200123. The reversal of 18200122 is 22100281.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16152361 + 2047761 = 4019^2 + 1431^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18200096 and 18200105.

It is not an unprimeable number, because it can be changed into a prime (18200123) 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 as a sum of consecutive naturals, namely, 4550029 + ... + 4550032.

Almost surely, 2^18200122 is an apocalyptic number.

18200122 is a deficient number, since it is larger than the sum of its proper divisors (9100064).

18200122 is an equidigital number, since it uses as much as digits as its factorization.

18200122 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9100063.

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 18200122 is about 4266.1601001369. The cubic root of 18200122 is about 263.0417991750.

The spelling of 18200122 in words is "eighteen million, two hundred thousand, one hundred twenty-two".