989623 has 2 divisors, whose sum is σ = 989624. Its totient is φ = 989622.

The previous prime is 989581. The next prime is 989629. The reversal of 989623 is 326989.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-989623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (989629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 494811 + 494812.

It is an arithmetic number, because the mean of its divisors is an integer number (494812).

2⁹⁸⁹⁶²³ is an apocalyptic number.

989623 is a deficient number, since it is larger than the sum of its proper divisors (1).

989623 is an equidigital number, since it uses as much as digits as its factorization.

989623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 23328, while the sum is 37.

The square root of 989623 is about 994.7979694390. The cubic root of 989623 is about 99.6528965862.

The spelling of 989623 in words is "nine hundred eighty-nine thousand, six hundred twenty-three".