1001887 has 4 divisors (see below), whose sum is σ = 1005856. Its totient is φ = 997920.

The previous prime is 1001839. The next prime is 1001911. The reversal of 1001887 is 7881001.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 7881001 = 743 ⋅10607.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1001887 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 (1001807) 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 in 3 ways as a sum of consecutive naturals, for example, 1578 + ... + 2119.

It is an arithmetic number, because the mean of its divisors is an integer number (251464).

2^1001887 is an apocalyptic number.

1001887 is a deficient number, since it is larger than the sum of its proper divisors (3969).

1001887 is an equidigital number, since it uses as much as digits as its factorization.

1001887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3968.

The product of its (nonzero) digits is 448, while the sum is 25.

The square root of 1001887 is about 1000.9430553233. The cubic root of 1001887 is about 100.0628604773.

Adding to 1001887 its reverse (7881001), we get a palindrome (8882888).

The spelling of 1001887 in words is "one million, one thousand, eight hundred eighty-seven".