123239993 has 2 divisors, whose sum is σ = 123239994. Its totient is φ = 123239992.

The previous prime is 123239983. The next prime is 123240011. The reversal of 123239993 is 399932321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 80048809 + 43191184 = 8947^2 + 6572^2 .

It is an emirp because it is prime and its reverse (399932321) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 123239993 - 2⁸ = 123239737 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 123239993.

It is not a weakly prime, because it can be changed into another prime (123239903) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61619996 + 61619997.

It is an arithmetic number, because the mean of its divisors is an integer number (61619997).

Almost surely, 2^123239993 is an apocalyptic number.

It is an amenable number.

123239993 is a deficient number, since it is larger than the sum of its proper divisors (1).

123239993 is an equidigital number, since it uses as much as digits as its factorization.

123239993 is an evil number, because the sum of its binary digits is even.

The product of its digits is 78732, while the sum is 41.

The square root of 123239993 is about 11101.3509538254. The cubic root of 123239993 is about 497.6422232538.

The spelling of 123239993 in words is "one hundred twenty-three million, two hundred thirty-nine thousand, nine hundred ninety-three".