987869 has 2 divisors, whose sum is σ = 987870. Its totient is φ = 987868.

The previous prime is 987851. The next prime is 987911. The reversal of 987869 is 968789.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 931225 + 56644 = 965^2 + 238^2 .

It is a cyclic number.

It is not a de Polignac number, because 987869 - 2¹⁶ = 922333 is a prime.

It is a super-2 number, since 2×987869² = 1951770322322, which contains 22 as substring.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (987809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 493934 + 493935.

It is an arithmetic number, because the mean of its divisors is an integer number (493935).

2⁹⁸⁷⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

987869 is a deficient number, since it is larger than the sum of its proper divisors (1).

987869 is an equidigital number, since it uses as much as digits as its factorization.

987869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 217728, while the sum is 47.

The square root of 987869 is about 993.9159924259. The cubic root of 987869 is about 99.5939870996.

It can be divided in two parts, 9 and 87869, that added together give a palindrome (87878).

The spelling of 987869 in words is "nine hundred eighty-seven thousand, eight hundred sixty-nine".