989959823 has 4 divisors (see below), whose sum is σ = 1002491040. Its totient is φ = 977428608.

The previous prime is 989959777. The next prime is 989959837. The reversal of 989959823 is 328959989.

It is a happy number.

989959823 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.

It is a cyclic number.

It is not a de Polignac number, because 989959823 - 2¹⁶ = 989894287 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (989959853) 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, 6265490 + ... + 6265647.

It is an arithmetic number, because the mean of its divisors is an integer number (250622760).

Almost surely, 2^989959823 is an apocalyptic number.

989959823 is a deficient number, since it is larger than the sum of its proper divisors (12531217).

989959823 is a wasteful number, since it uses less digits than its factorization.

989959823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12531216.

The product of its digits is 12597120, while the sum is 62.

The square root of 989959823 is about 31463.6269841860. The cubic root of 989959823 is about 996.6420108640.

The spelling of 989959823 in words is "nine hundred eighty-nine million, nine hundred fifty-nine thousand, eight hundred twenty-three".