1868749 has 2 divisors, whose sum is σ = 1868750. Its totient is φ = 1868748.

The previous prime is 1868747. The next prime is 1868753. The reversal of 1868749 is 9478681.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1368900 + 499849 = 1170^2 + 707^2 .

It is an emirp because it is prime and its reverse (9478681) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1868749 - 2¹ = 1868747 is a prime.

Together with 1868747, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1868747) 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, 934374 + 934375.

It is an arithmetic number, because the mean of its divisors is an integer number (934375).

2^1868749 is an apocalyptic number.

It is an amenable number.

1868749 is a deficient number, since it is larger than the sum of its proper divisors (1).

1868749 is an equidigital number, since it uses as much as digits as its factorization.

1868749 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 96768, while the sum is 43.

The square root of 1868749 is about 1367.0219456907. The cubic root of 1868749 is about 123.1734174460.

The spelling of 1868749 in words is "one million, eight hundred sixty-eight thousand, seven hundred forty-nine".