1840991899 has 2 divisors, whose sum is σ = 1840991900. Its totient is φ = 1840991898.

The previous prime is 1840991861. The next prime is 1840991917. The reversal of 1840991899 is 9981990481.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1840991899 - 2⁷ = 1840991771 is a prime.

It is not a weakly prime, because it can be changed into another prime (1840991839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 920495949 + 920495950.

It is an arithmetic number, because the mean of its divisors is an integer number (920495950).

Almost surely, 2^1840991899 is an apocalyptic number.

1840991899 is a deficient number, since it is larger than the sum of its proper divisors (1).

1840991899 is an equidigital number, since it uses as much as digits as its factorization.

1840991899 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1679616, while the sum is 58.

The square root of 1840991899 is about 42906.7815036271. The cubic root of 1840991899 is about 1225.6052872101.

The spelling of 1840991899 in words is "one billion, eight hundred forty million, nine hundred ninety-one thousand, eight hundred ninety-nine".