989963869 has 4 divisors (see below), whose sum is σ = 990243900. Its totient is φ = 989683840.

The previous prime is 989963851. The next prime is 989963881. The reversal of 989963869 is 968369989.

989963869 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 968369989 = 23 ⋅42103043.

It can be written as a sum of positive squares in 2 ways, for example, as 593555769 + 396408100 = 24363^2 + 19910^2 .

It is a cyclic number.

It is not a de Polignac number, because 989963869 - 2²⁹ = 453092957 is a prime.

It is a super-2 number, since 2×989963869² = 1960056923850898322, 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 (989963899) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134644 + ... + 141805.

It is an arithmetic number, because the mean of its divisors is an integer number (247560975).

Almost surely, 2^989963869 is an apocalyptic number.

It is an amenable number.

989963869 is a deficient number, since it is larger than the sum of its proper divisors (280031).

989963869 is a wasteful number, since it uses less digits than its factorization.

989963869 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280030.

The product of its digits is 45349632, while the sum is 67.

The square root of 989963869 is about 31463.6912805856. The cubic root of 989963869 is about 996.6433686322.

The spelling of 989963869 in words is "nine hundred eighty-nine million, nine hundred sixty-three thousand, eight hundred sixty-nine".