1020987 has 12 divisors (see below), whose sum is σ = 1608984. Its totient is φ = 618720.

The previous prime is 1020979. The next prime is 1020989. The reversal of 1020987 is 7890201.

It is not a de Polignac number, because 1020987 - 2³ = 1020979 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1020987.

It is not an unprimeable number, because it can be changed into a prime (1020989) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5058 + ... + 5255.

It is an arithmetic number, because the mean of its divisors is an integer number (134082).

2^1020987 is an apocalyptic number.

1020987 is a deficient number, since it is larger than the sum of its proper divisors (587997).

1020987 is a wasteful number, since it uses less digits than its factorization.

1020987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10330 (or 10327 counting only the distinct ones).

The product of its (nonzero) digits is 1008, while the sum is 27.

The square root of 1020987 is about 1010.4390134986. The cubic root of 1020987 is about 100.6947290058.

It can be divided in two parts, 10209 and 87, that added together give a triangular number (10296 = T₁₄₃).

The spelling of 1020987 in words is "one million, twenty thousand, nine hundred eighty-seven".