1840641857 has 2 divisors, whose sum is σ = 1840641858. Its totient is φ = 1840641856.

The previous prime is 1840641851. The next prime is 1840641883. The reversal of 1840641857 is 7581460481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1263873601 + 576768256 = 35551^2 + 24016^2 .

It is a cyclic number.

It is not a de Polignac number, because 1840641857 - 2⁸ = 1840641601 is a prime.

It is not a weakly prime, because it can be changed into another prime (1840641851) 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 as a sum of consecutive naturals, namely, 920320928 + 920320929.

It is an arithmetic number, because the mean of its divisors is an integer number (920320929).

Almost surely, 2^1840641857 is an apocalyptic number.

It is an amenable number.

1840641857 is a deficient number, since it is larger than the sum of its proper divisors (1).

1840641857 is an equidigital number, since it uses as much as digits as its factorization.

1840641857 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 215040, while the sum is 44.

The square root of 1840641857 is about 42902.7022109331. The cubic root of 1840641857 is about 1225.5276043552.

The spelling of 1840641857 in words is "one billion, eight hundred forty million, six hundred forty-one thousand, eight hundred fifty-seven".