871990 has 16 divisors (see below), whose sum is σ = 1793952. Its totient is φ = 298944.

The previous prime is 871987. The next prime is 871993. The reversal of 871990 is 99178.

It is an interprime number because it is at equal distance from previous prime (871987) and next prime (871993).

It is an Ulam number.

It is a plaindrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (871993) 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 7 ways as a sum of consecutive naturals, for example, 6159 + ... + 6298.

It is an arithmetic number, because the mean of its divisors is an integer number (112122).

2⁸⁷¹⁹⁹⁰ is an apocalyptic number.

871990 is an abundant number, since it is smaller than the sum of its proper divisors (921962).

It is a weird number, because it is abundant, but not a pseudoperfect number.

871990 is a wasteful number, since it uses less digits than its factorization.

871990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12471.

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

The square root of 871990 is about 933.8040479672. The cubic root of 871990 is about 95.5367584162.

The spelling of 871990 in words is "eight hundred seventy-one thousand, nine hundred ninety".