990871 has 8 divisors (see below), whose sum is σ = 1138464. Its totient is φ = 844800.

The previous prime is 990851. The next prime is 990881. The reversal of 990871 is 178099.

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 990871 - 2⁹ = 990359 is a prime.

It is an Ulam number.

It is a Duffinian number.

990871 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2271 + ... + 2671.

It is an arithmetic number, because the mean of its divisors is an integer number (142308).

2⁹⁹⁰⁸⁷¹ is an apocalyptic number.

990871 is a deficient number, since it is larger than the sum of its proper divisors (147593).

990871 is a wasteful number, since it uses less digits than its factorization.

990871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 761.

The product of its (nonzero) digits is 4536, while the sum is 34.

The square root of 990871 is about 995.4250348469. The cubic root of 990871 is about 99.6947692900.

The spelling of 990871 in words is "nine hundred ninety thousand, eight hundred seventy-one".