18901822 has 4 divisors (see below), whose sum is σ = 28352736. Its totient is φ = 9450910.

The previous prime is 18901801. The next prime is 18901829. The reversal of 18901822 is 22810981.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 22810981 = 37 ⋅616513.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18901829) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4725454 + ... + 4725457.

It is an arithmetic number, because the mean of its divisors is an integer number (7088184).

Almost surely, 2^18901822 is an apocalyptic number.

18901822 is a deficient number, since it is larger than the sum of its proper divisors (9450914).

18901822 is an equidigital number, since it uses as much as digits as its factorization.

18901822 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9450913.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 18901822 is about 4347.6225687150. The cubic root of 18901822 is about 266.3797598302.

The spelling of 18901822 in words is "eighteen million, nine hundred one thousand, eight hundred twenty-two".