1990893227 has 4 divisors (see below), whose sum is σ = 2024637240. Its totient is φ = 1957149216.

The previous prime is 1990893209. The next prime is 1990893241. The reversal of 1990893227 is 7223980991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7223980991 = 55163 ⋅130957.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1990893227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1990893287) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16871918 + ... + 16872035.

It is an arithmetic number, because the mean of its divisors is an integer number (506159310).

Almost surely, 2^1990893227 is an apocalyptic number.

1990893227 is a deficient number, since it is larger than the sum of its proper divisors (33744013).

1990893227 is an equidigital number, since it uses as much as digits as its factorization.

1990893227 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33744012.

The product of its (nonzero) digits is 489888, while the sum is 50.

The square root of 1990893227 is about 44619.4265651185. The cubic root of 1990893227 is about 1258.0058375462.

The spelling of 1990893227 in words is "one billion, nine hundred ninety million, eight hundred ninety-three thousand, two hundred twenty-seven".