989996923 has 2 divisors, whose sum is σ = 989996924. Its totient is φ = 989996922.

The previous prime is 989996893. The next prime is 989996939. The reversal of 989996923 is 329699989.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-989996923 is a prime.

It is not a weakly prime, because it can be changed into another prime (989996993) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494998461 + 494998462.

It is an arithmetic number, because the mean of its divisors is an integer number (494998462).

Almost surely, 2^989996923 is an apocalyptic number.

989996923 is a deficient number, since it is larger than the sum of its proper divisors (1).

989996923 is an equidigital number, since it uses as much as digits as its factorization.

989996923 is an evil number, because the sum of its binary digits is even.

The product of its digits is 17006112, while the sum is 64.

The square root of 989996923 is about 31464.2165483268. The cubic root of 989996923 is about 996.6544608496.

The spelling of 989996923 in words is "nine hundred eighty-nine million, nine hundred ninety-six thousand, nine hundred twenty-three".