988997869 has 4 divisors (see below), whose sum is σ = 989129596. Its totient is φ = 988866144.

The previous prime is 988997857. The next prime is 988997873. The reversal of 988997869 is 968799889.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 968799889 = 131 ⋅7395419.

It can be written as a sum of positive squares in 2 ways, for example, as 422795844 + 566202025 = 20562^2 + 23795^2 .

It is a cyclic number.

It is not a de Polignac number, because 988997869 - 2¹⁵ = 988965101 is a prime.

It is a super-2 number, since 2×988997869² = 1956233569773082322, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (988997069) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 53874 + ... + 69859.

It is an arithmetic number, because the mean of its divisors is an integer number (247282399).

Almost surely, 2^988997869 is an apocalyptic number.

It is an amenable number.

988997869 is a deficient number, since it is larger than the sum of its proper divisors (131727).

988997869 is a wasteful number, since it uses less digits than its factorization.

988997869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 131726.

The product of its digits is 141087744, while the sum is 73.

The square root of 988997869 is about 31448.3365060857. The cubic root of 988997869 is about 996.3190905298.

The spelling of 988997869 in words is "nine hundred eighty-eight million, nine hundred ninety-seven thousand, eight hundred sixty-nine".