989857969 has 4 divisors (see below), whose sum is σ = 1032895296. Its totient is φ = 946820644.

The previous prime is 989857949. The next prime is 989858021. The reversal of 989857969 is 969758989.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 969758989 = 839 ⋅1155851.

It is a cyclic number.

It is not a de Polignac number, because 989857969 - 2¹⁵ = 989825201 is a prime.

It is a super-2 number, since 2×989857969² = 1959637597585609922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 989857898 and 989857907.

It is not an unprimeable number, because it can be changed into a prime (989857949) 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, 21518629 + ... + 21518674.

It is an arithmetic number, because the mean of its divisors is an integer number (258223824).

Almost surely, 2^989857969 is an apocalyptic number.

It is an amenable number.

989857969 is a deficient number, since it is larger than the sum of its proper divisors (43037327).

989857969 is a wasteful number, since it uses less digits than its factorization.

989857969 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43037326.

The product of its digits is 88179840, while the sum is 70.

The square root of 989857969 is about 31462.0083433973. The cubic root of 989857969 is about 996.6078291882.

The spelling of 989857969 in words is "nine hundred eighty-nine million, eight hundred fifty-seven thousand, nine hundred sixty-nine".