987905 has 8 divisors (see below), whose sum is σ = 1248000. Its totient is φ = 748656.

The previous prime is 987869. The next prime is 987911. The reversal of 987905 is 509789.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 987905 - 2¹² = 983809 is a prime.

It is an Ulam number.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5105 + ... + 5294.

It is an arithmetic number, because the mean of its divisors is an integer number (156000).

2⁹⁸⁷⁹⁰⁵ is an apocalyptic number.

987905 is a gapful number since it is divisible by the number (95) formed by its first and last digit.

It is an amenable number.

987905 is a deficient number, since it is larger than the sum of its proper divisors (260095).

987905 is a wasteful number, since it uses less digits than its factorization.

987905 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10423.

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

The square root of 987905 is about 993.9341024434. The cubic root of 987905 is about 99.5951968889.

The spelling of 987905 in words is "nine hundred eighty-seven thousand, nine hundred five".