905987 has 4 divisors (see below), whose sum is σ = 908040. Its totient is φ = 903936.

The previous prime is 905963. The next prime is 905999. The reversal of 905987 is 789509.

905987 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 789509 = 7 ⋅112787.

It is a cyclic number.

It is not a de Polignac number, because 905987 - 2⁶ = 905923 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 905987.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 905987.

It is not an unprimeable number, because it can be changed into a prime (905917) 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, 62 + ... + 1347.

It is an arithmetic number, because the mean of its divisors is an integer number (227010).

2⁹⁰⁵⁹⁸⁷ is an apocalyptic number.

905987 is a deficient number, since it is larger than the sum of its proper divisors (2053).

905987 is a wasteful number, since it uses less digits than its factorization.

905987 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2052.

The product of its (nonzero) digits is 22680, while the sum is 38.

The square root of 905987 is about 951.8334938423. The cubic root of 905987 is about 96.7625538175.

The spelling of 905987 in words is "nine hundred five thousand, nine hundred eighty-seven".