1800684749 has 2 divisors, whose sum is σ = 1800684750. Its totient is φ = 1800684748.

The previous prime is 1800684731. The next prime is 1800684773. The reversal of 1800684749 is 9474860081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1258120900 + 542563849 = 35470^2 + 23293^2 .

It is a cyclic number.

It is not a de Polignac number, because 1800684749 - 2¹² = 1800680653 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1800684709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 900342374 + 900342375.

It is an arithmetic number, because the mean of its divisors is an integer number (900342375).

Almost surely, 2^1800684749 is an apocalyptic number.

It is an amenable number.

1800684749 is a deficient number, since it is larger than the sum of its proper divisors (1).

1800684749 is an equidigital number, since it uses as much as digits as its factorization.

1800684749 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 387072, while the sum is 47.

The square root of 1800684749 is about 42434.4759482193. The cubic root of 1800684749 is about 1216.5946307343.

The spelling of 1800684749 in words is "one billion, eight hundred million, six hundred eighty-four thousand, seven hundred forty-nine".