987890 has 16 divisors (see below), whose sum is σ = 1790208. Its totient is φ = 392496.

The previous prime is 987869. The next prime is 987911. The reversal of 987890 is 98789.

It is an interprime number because it is at equal distance from previous prime (987869) and next prime (987911).

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

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, 2009 + ... + 2451.

It is an arithmetic number, because the mean of its divisors is an integer number (111888).

2⁹⁸⁷⁸⁹⁰ is an apocalyptic number.

987890 is a deficient number, since it is larger than the sum of its proper divisors (802318).

987890 is a wasteful number, since it uses less digits than its factorization.

987890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 673.

The product of its (nonzero) digits is 36288, while the sum is 41.

The square root of 987890 is about 993.9265566429. The cubic root of 987890 is about 99.5946928136.

The spelling of 987890 in words is "nine hundred eighty-seven thousand, eight hundred ninety".