18019922 has 4 divisors (see below), whose sum is σ = 27029886. Its totient is φ = 9009960.

The previous prime is 18019921. The next prime is 18019927. The reversal of 18019922 is 22991081.

It is a happy number.

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., 17799961 + 219961 = 4219^2 + 469^2 .

It is not an unprimeable number, because it can be changed into a prime (18019921) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4504979 + ... + 4504982.

Almost surely, 2^18019922 is an apocalyptic number.

18019922 is a deficient number, since it is larger than the sum of its proper divisors (9009964).

18019922 is an equidigital number, since it uses as much as digits as its factorization.

18019922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9009963.

The product of its (nonzero) digits is 2592, while the sum is 32.

The square root of 18019922 is about 4244.9878680628. The cubic root of 18019922 is about 262.1707897174.

It can be divided in two parts, 180 and 19922, that added together give a palindrome (20102).

The spelling of 18019922 in words is "eighteen million, nineteen thousand, nine hundred twenty-two".