123793921 has 2 divisors, whose sum is σ = 123793922. Its totient is φ = 123793920.

The previous prime is 123793909. The next prime is 123793931. The reversal of 123793921 is 129397321.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 89113600 + 34680321 = 9440^2 + 5889^2 .

It is a cyclic number.

It is not a de Polignac number, because 123793921 - 2⁹ = 123793409 is a prime.

It is not a weakly prime, because it can be changed into another prime (123793931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61896960 + 61896961.

It is an arithmetic number, because the mean of its divisors is an integer number (61896961).

Almost surely, 2^123793921 is an apocalyptic number.

It is an amenable number.

123793921 is a deficient number, since it is larger than the sum of its proper divisors (1).

123793921 is an equidigital number, since it uses as much as digits as its factorization.

123793921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 20412, while the sum is 37.

The square root of 123793921 is about 11126.2716576578. The cubic root of 123793921 is about 498.3866947578.

The spelling of 123793921 in words is "one hundred twenty-three million, seven hundred ninety-three thousand, nine hundred twenty-one".