1798987 has 2 divisors, whose sum is σ = 1798988. Its totient is φ = 1798986.

The previous prime is 1798967. The next prime is 1798997. The reversal of 1798987 is 7898971.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1798987 is a prime.

It is a Chen prime.

1798987 is a lucky number.

It is a self number, because there is not a number n which added to its sum of digits gives 1798987.

It is not a weakly prime, because it can be changed into another prime (1798967) 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, 899493 + 899494.

It is an arithmetic number, because the mean of its divisors is an integer number (899494).

2^1798987 is an apocalyptic number.

1798987 is a deficient number, since it is larger than the sum of its proper divisors (1).

1798987 is an equidigital number, since it uses as much as digits as its factorization.

1798987 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 254016, while the sum is 49.

The square root of 1798987 is about 1341.2632105594. The cubic root of 1798987 is about 121.6212161085.

The spelling of 1798987 in words is "one million, seven hundred ninety-eight thousand, nine hundred eighty-seven".