1005989 has 2 divisors, whose sum is σ = 1005990. Its totient is φ = 1005988.

The previous prime is 1005971. The next prime is 1006003. The reversal of 1005989 is 9895001.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 708964 + 297025 = 842^2 + 545^2 .

It is an emirp because it is prime and its reverse (9895001) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1005989 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1005959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 502994 + 502995.

It is an arithmetic number, because the mean of its divisors is an integer number (502995).

2^1005989 is an apocalyptic number.

It is an amenable number.

1005989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1005989 is an equidigital number, since it uses as much as digits as its factorization.

1005989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3240, while the sum is 32.

The square root of 1005989 is about 1002.9900298607. The cubic root of 1005989 is about 100.1992361194.

The spelling of 1005989 in words is "one million, five thousand, nine hundred eighty-nine".