1987001 has 4 divisors (see below), whose sum is σ = 2091600. Its totient is φ = 1882404.

The previous prime is 1986997. The next prime is 1987003. The reversal of 1987001 is 1007891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1987001 - 2² = 1986997 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1987003) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52271 + ... + 52308.

It is an arithmetic number, because the mean of its divisors is an integer number (522900).

2^1987001 is an apocalyptic number.

It is an amenable number.

1987001 is a deficient number, since it is larger than the sum of its proper divisors (104599).

1987001 is a wasteful number, since it uses less digits than its factorization.

1987001 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104598.

The product of its (nonzero) digits is 504, while the sum is 26.

The square root of 1987001 is about 1409.6102298153. The cubic root of 1987001 is about 125.7185495774.

The spelling of 1987001 in words is "one million, nine hundred eighty-seven thousand, one".