123994009 has 2 divisors, whose sum is σ = 123994010. Its totient is φ = 123994008.

The previous prime is 123993997. The next prime is 123994049. The reversal of 123994009 is 900499321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 120560400 + 3433609 = 10980^2 + 1853^2 .

It is an emirp because it is prime and its reverse (900499321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123994009 - 2²³ = 115605401 is a prime.

It is not a weakly prime, because it can be changed into another prime (123994049) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61997004 + 61997005.

It is an arithmetic number, because the mean of its divisors is an integer number (61997005).

Almost surely, 2^123994009 is an apocalyptic number.

It is an amenable number.

123994009 is a deficient number, since it is larger than the sum of its proper divisors (1).

123994009 is an equidigital number, since it uses as much as digits as its factorization.

123994009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 123994009 is about 11135.2597185697. The cubic root of 123994009 is about 498.6550642058.

The spelling of 123994009 in words is "one hundred twenty-three million, nine hundred ninety-four thousand, nine".