987669 has 6 divisors (see below), whose sum is σ = 1426646. Its totient is φ = 658440.

The previous prime is 987659. The next prime is 987697. The reversal of 987669 is 966789.

It can be written as a sum of positive squares in only one way, i.e., 980100 + 7569 = 990^2 + 87^2 .

It is not a de Polignac number, because 987669 - 2⁷ = 987541 is a prime.

It is a super-2 number, since 2×987669² = 1950980107122, which contains 22 as substring.

It is a Duffinian 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 (987659) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 54862 + ... + 54879.

2⁹⁸⁷⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

987669 is a deficient number, since it is larger than the sum of its proper divisors (438977).

987669 is a wasteful number, since it uses less digits than its factorization.

987669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109747 (or 109744 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 987669 is about 993.8153752081. The cubic root of 987669 is about 99.5872655127.

It can be divided in two parts, 9 and 87669, that added together give a palindrome (87678).

The spelling of 987669 in words is "nine hundred eighty-seven thousand, six hundred sixty-nine".