1011987 has 16 divisors (see below), whose sum is σ = 1541280. Its totient is φ = 655776.

The previous prime is 1011979. The next prime is 1012007. The reversal of 1011987 is 7891101.

It is not a de Polignac number, because 1011987 - 2³ = 1011979 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a self number, because there is not a number n which added to its sum of digits gives 1011987.

It is not an unprimeable number, because it can be changed into a prime (1011917) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 493 + ... + 1505.

It is an arithmetic number, because the mean of its divisors is an integer number (96330).

2^1011987 is an apocalyptic number.

1011987 is a deficient number, since it is larger than the sum of its proper divisors (529293).

1011987 is a wasteful number, since it uses less digits than its factorization.

1011987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1059 (or 1053 counting only the distinct ones).

The product of its (nonzero) digits is 504, while the sum is 27.

The square root of 1011987 is about 1005.9756458285. The cubic root of 1011987 is about 100.3979806793.

The spelling of 1011987 in words is "one million, eleven thousand, nine hundred eighty-seven".