18390122236 has 12 divisors (see below), whose sum is σ = 33581962512. Its totient is φ = 8795275808.

The previous prime is 18390122123. The next prime is 18390122237. The reversal of 18390122236 is 63222109381.

It is a junction number, because it is equal to n+sod(n) for n = 18390122195 and 18390122204.

It is a congruent number.

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

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99946225 + ... + 99946408.

It is an arithmetic number, because the mean of its divisors is an integer number (2798496876).

Almost surely, 2^18390122236 is an apocalyptic number.

It is an amenable number.

18390122236 is a deficient number, since it is larger than the sum of its proper divisors (15191840276).

18390122236 is a wasteful number, since it uses less digits than its factorization.

18390122236 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199892660 (or 199892658 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 37.

The spelling of 18390122236 in words is "eighteen billion, three hundred ninety million, one hundred twenty-two thousand, two hundred thirty-six".