1798861 has 2 divisors, whose sum is σ = 1798862. Its totient is φ = 1798860.

The previous prime is 1798817. The next prime is 1798871. The reversal of 1798861 is 1688971.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1142761 + 656100 = 1069^2 + 810^2 .

It is an emirp because it is prime and its reverse (1688971) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1798861 - 2¹³ = 1790669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1798801) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 899430 + 899431.

It is an arithmetic number, because the mean of its divisors is an integer number (899431).

2^1798861 is an apocalyptic number.

It is an amenable number.

1798861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1798861 is an equidigital number, since it uses as much as digits as its factorization.

1798861 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 24192, while the sum is 40.

The square root of 1798861 is about 1341.2162390905. The cubic root of 1798861 is about 121.6183766159.

The spelling of 1798861 in words is "one million, seven hundred ninety-eight thousand, eight hundred sixty-one".