1840040291 has 2 divisors, whose sum is σ = 1840040292. Its totient is φ = 1840040290.

The previous prime is 1840040281. The next prime is 1840040297. The reversal of 1840040291 is 1920400481.

It is a strong prime.

It is an emirp because it is prime and its reverse (1920400481) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1840040291 is a prime.

It is not a weakly prime, because it can be changed into another prime (1840040297) 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 as a sum of consecutive naturals, namely, 920020145 + 920020146.

It is an arithmetic number, because the mean of its divisors is an integer number (920020146).

Almost surely, 2^1840040291 is an apocalyptic number.

1840040291 is a deficient number, since it is larger than the sum of its proper divisors (1).

1840040291 is an equidigital number, since it uses as much as digits as its factorization.

1840040291 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 1840040291 is about 42895.6908208738. The cubic root of 1840040291 is about 1225.3940791819.

The spelling of 1840040291 in words is "one billion, eight hundred forty million, forty thousand, two hundred ninety-one".