1840287749 has 2 divisors, whose sum is σ = 1840287750. Its totient is φ = 1840287748.

The previous prime is 1840287721. The next prime is 1840287817. The reversal of 1840287749 is 9477820481.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 982383649 + 857904100 = 31343^2 + 29290^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1840287749 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1840287697 and 1840287706.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1840287649) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 920143874 + 920143875.

It is an arithmetic number, because the mean of its divisors is an integer number (920143875).

Almost surely, 2^1840287749 is an apocalyptic number.

It is an amenable number.

1840287749 is a deficient number, since it is larger than the sum of its proper divisors (1).

1840287749 is an equidigital number, since it uses as much as digits as its factorization.

1840287749 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 903168, while the sum is 50.

The square root of 1840287749 is about 42898.5751395078. The cubic root of 1840287749 is about 1225.4490091341.

The spelling of 1840287749 in words is "one billion, eight hundred forty million, two hundred eighty-seven thousand, seven hundred forty-nine".