123029989 has 2 divisors, whose sum is σ = 123029990. Its totient is φ = 123029988.

The previous prime is 123029983. The next prime is 123029999. The reversal of 123029989 is 989920321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 108513889 + 14516100 = 10417^2 + 3810^2 .

It is a cyclic number.

It is not a de Polignac number, because 123029989 - 2¹³ = 123021797 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (123029983) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61514994 + 61514995.

It is an arithmetic number, because the mean of its divisors is an integer number (61514995).

Almost surely, 2^123029989 is an apocalyptic number.

It is an amenable number.

123029989 is a deficient number, since it is larger than the sum of its proper divisors (1).

123029989 is an equidigital number, since it uses as much as digits as its factorization.

123029989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 123029989 is about 11091.8884325438. Note that the first 3 decimals coincide. The cubic root of 123029989 is about 497.3593976550.

The spelling of 123029989 in words is "one hundred twenty-three million, twenty-nine thousand, nine hundred eighty-nine".