987931 has 8 divisors (see below), whose sum is σ = 1140480. Its totient is φ = 838248.

The previous prime is 987929. The next prime is 987941. The reversal of 987931 is 139789.

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 987931 - 2¹ = 987929 is a prime.

It is a super-2 number, since 2×987931² = 1952015321522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (987911) 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, 90 + ... + 1408.

It is an arithmetic number, because the mean of its divisors is an integer number (142560).

2⁹⁸⁷⁹³¹ is an apocalyptic number.

987931 is a deficient number, since it is larger than the sum of its proper divisors (152549).

987931 is a wasteful number, since it uses less digits than its factorization.

987931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1433.

The product of its digits is 13608, while the sum is 37.

The square root of 987931 is about 993.9471816953. The cubic root of 987931 is about 99.5960706073.

The spelling of 987931 in words is "nine hundred eighty-seven thousand, nine hundred thirty-one".