18540022 has 4 divisors (see below), whose sum is σ = 27810036. Its totient is φ = 9270010.

The previous prime is 18540007. The next prime is 18540031. The reversal of 18540022 is 22004581.

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

It is a Smith number, since the sum of its digits (22) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a junction number, because it is equal to n+sod(n) for n = 18539975 and 18540002.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4635004 + ... + 4635007.

It is an arithmetic number, because the mean of its divisors is an integer number (6952509).

Almost surely, 2^18540022 is an apocalyptic number.

18540022 is a deficient number, since it is larger than the sum of its proper divisors (9270014).

18540022 is an equidigital number, since it uses as much as digits as its factorization.

18540022 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9270013.

The product of its (nonzero) digits is 640, while the sum is 22.

The square root of 18540022 is about 4305.8125830092. The cubic root of 18540022 is about 264.6692063309.

The spelling of 18540022 in words is "eighteen million, five hundred forty thousand, twenty-two".