1840393187849 has 2 divisors, whose sum is σ = 1840393187850. Its totient is φ = 1840393187848.

The previous prime is 1840393187839. The next prime is 1840393187917. The reversal of 1840393187849 is 9487813930481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1041706009600 + 798687178249 = 1020640^2 + 893693^2 .

It is a cyclic number.

It is not a de Polignac number, because 1840393187849 - 2¹² = 1840393183753 is a prime.

It is not a weakly prime, because it can be changed into another prime (1840393187819) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 920196593924 + 920196593925.

It is an arithmetic number, because the mean of its divisors is an integer number (920196593925).

Almost surely, 2^{1840393187849} is an apocalyptic number.

It is an amenable number.

1840393187849 is a deficient number, since it is larger than the sum of its proper divisors (1).

1840393187849 is an equidigital number, since it uses as much as digits as its factorization.

1840393187849 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 41803776, while the sum is 65.

The spelling of 1840393187849 in words is "one trillion, eight hundred forty billion, three hundred ninety-three million, one hundred eighty-seven thousand, eight hundred forty-nine".