1840189369 has 2 divisors, whose sum is σ = 1840189370. Its totient is φ = 1840189368.

The previous prime is 1840189331. The next prime is 1840189381. The reversal of 1840189369 is 9639810481.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1750167225 + 90022144 = 41835^2 + 9488^2 .

It is a cyclic number.

It is not a de Polignac number, because 1840189369 - 2¹⁵ = 1840156601 is a prime.

It is a super-2 number, since 2×1840189369² = 6772593827561236322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1840189669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 920094684 + 920094685.

It is an arithmetic number, because the mean of its divisors is an integer number (920094685).

Almost surely, 2^1840189369 is an apocalyptic number.

It is an amenable number.

1840189369 is a deficient number, since it is larger than the sum of its proper divisors (1).

1840189369 is an equidigital number, since it uses as much as digits as its factorization.

1840189369 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 373248, while the sum is 49.

The square root of 1840189369 is about 42897.4284660514. The cubic root of 1840189369 is about 1225.4271716394.

The spelling of 1840189369 in words is "one billion, eight hundred forty million, one hundred eighty-nine thousand, three hundred sixty-nine".