18390122235 has 12 divisors (see below), whose sum is σ = 31876211952. Its totient is φ = 9808065168.

The previous prime is 18390122123. The next prime is 18390122237. The reversal of 18390122235 is 53222109381.

18390122235 is a `hidden beast` number, since 18 + 390 + 1 + 22 + 235 = 666.

It is not a de Polignac number, because 18390122235 - 2¹¹ = 18390120187 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 18390122235.

It is not an unprimeable number, because it can be changed into a prime (18390122237) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 204334647 + ... + 204334736.

It is an arithmetic number, because the mean of its divisors is an integer number (2656350996).

Almost surely, 2^18390122235 is an apocalyptic number.

18390122235 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18390122235 is a deficient number, since it is larger than the sum of its proper divisors (13486089717).

18390122235 is a wasteful number, since it uses less digits than its factorization.

18390122235 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 408669394 (or 408669391 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

It can be divided in two parts, 18390 and 122235, that added together give a square (140625 = 375²).

The spelling of 18390122235 in words is "eighteen billion, three hundred ninety million, one hundred twenty-two thousand, two hundred thirty-five".