2017989 has 6 divisors (see below), whose sum is σ = 2914886. Its totient is φ = 1345320.

The previous prime is 2017987. The next prime is 2017991. The reversal of 2017989 is 9897102.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (2017987) and next prime (2017991).

It can be written as a sum of positive squares in only one way, i.e., 1361889 + 656100 = 1167^2 + 810^2 .

It is not a de Polignac number, because 2017989 - 2¹ = 2017987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2017987) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 112102 + ... + 112119.

2^2017989 is an apocalyptic number.

It is an amenable number.

2017989 is a deficient number, since it is larger than the sum of its proper divisors (896897).

2017989 is a wasteful number, since it uses less digits than its factorization.

2017989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224227 (or 224224 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 2017989 is about 1420.5593968574. The cubic root of 2017989 is about 126.3687234010.

The spelling of 2017989 in words is "two million, seventeen thousand, nine hundred eighty-nine".