1812749 has 2 divisors, whose sum is σ = 1812750. Its totient is φ = 1812748.

The previous prime is 1812721. The next prime is 1812763. The reversal of 1812749 is 9472181.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1737124 + 75625 = 1318^2 + 275^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1812749 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1812449) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 906374 + 906375.

It is an arithmetic number, because the mean of its divisors is an integer number (906375).

2^1812749 is an apocalyptic number.

It is an amenable number.

1812749 is a deficient number, since it is larger than the sum of its proper divisors (1).

1812749 is an equidigital number, since it uses as much as digits as its factorization.

1812749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 4032, while the sum is 32.

The square root of 1812749 is about 1346.3836748862. The cubic root of 1812749 is about 121.9305570941.

The spelling of 1812749 in words is "one million, eight hundred twelve thousand, seven hundred forty-nine".