1802227209 has 4 divisors (see below), whose sum is σ = 2402969616. Its totient is φ = 1201484804.

The previous prime is 1802227187. The next prime is 1802227213. The reversal of 1802227209 is 9027222081.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1802227209 - 2⁷ = 1802227081 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1802227209.

It is not an unprimeable number, because it can be changed into a prime (1802227279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 300371199 + ... + 300371204.

It is an arithmetic number, because the mean of its divisors is an integer number (600742404).

Almost surely, 2^1802227209 is an apocalyptic number.

It is an amenable number.

1802227209 is a deficient number, since it is larger than the sum of its proper divisors (600742407).

1802227209 is an equidigital number, since it uses as much as digits as its factorization.

1802227209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 600742406.

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 1802227209 is about 42452.6466666096. The cubic root of 1802227209 is about 1216.9419084380.

The spelling of 1802227209 in words is "one billion, eight hundred two million, two hundred twenty-seven thousand, two hundred nine".