989869 has 2 divisors, whose sum is σ = 989870. Its totient is φ = 989868.

The previous prime is 989839. The next prime is 989873. The reversal of 989869 is 968989.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 927369 + 62500 = 963^2 + 250^2 .

It is a cyclic number.

It is not a de Polignac number, because 989869 - 2⁵ = 989837 is a prime.

It is a super-2 number, since 2×989869² = 1959681274322, 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 (989839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494934 + 494935.

It is an arithmetic number, because the mean of its divisors is an integer number (494935).

2⁹⁸⁹⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

989869 is a deficient number, since it is larger than the sum of its proper divisors (1).

989869 is an equidigital number, since it uses as much as digits as its factorization.

989869 is an evil number, because the sum of its binary digits is even.

The product of its digits is 279936, while the sum is 49.

The square root of 989869 is about 994.9216049519. The cubic root of 989869 is about 99.6611531248.

The spelling of 989869 in words is "nine hundred eighty-nine thousand, eight hundred sixty-nine".