920987 has 4 divisors (see below), whose sum is σ = 969480. Its totient is φ = 872496.

The previous prime is 920971. The next prime is 920999. The reversal of 920987 is 789029.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 920987 - 2⁴ = 920971 is a prime.

It is a Duffinian number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 920987.

It is not an unprimeable number, because it can be changed into a prime (920947) 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 3 ways as a sum of consecutive naturals, for example, 24218 + ... + 24255.

It is an arithmetic number, because the mean of its divisors is an integer number (242370).

2⁹²⁰⁹⁸⁷ is an apocalyptic number.

920987 is a deficient number, since it is larger than the sum of its proper divisors (48493).

920987 is a wasteful number, since it uses less digits than its factorization.

920987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48492.

The product of its (nonzero) digits is 9072, while the sum is 35.

The square root of 920987 is about 959.6806760584. The cubic root of 920987 is about 97.2936508136.

The spelling of 920987 in words is "nine hundred twenty thousand, nine hundred eighty-seven".