2019987 has 6 divisors (see below), whose sum is σ = 2917772. Its totient is φ = 1346652.

The previous prime is 2019977. The next prime is 2020001. The reversal of 2019987 is 7899102.

It is a happy number.

It is not a de Polignac number, because 2019987 - 2⁷ = 2019859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2019907) 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, 112213 + ... + 112230.

2^2019987 is an apocalyptic number.

2019987 is a deficient number, since it is larger than the sum of its proper divisors (897785).

2019987 is a wasteful number, since it uses less digits than its factorization.

2019987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 224449 (or 224446 counting only the distinct ones).

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

The square root of 2019987 is about 1421.2624669638. The cubic root of 2019987 is about 126.4104153077.

The spelling of 2019987 in words is "two million, nineteen thousand, nine hundred eighty-seven".