123917929 has 2 divisors, whose sum is σ = 123917930. Its totient is φ = 123917928.

The previous prime is 123917923. The next prime is 123917939. The reversal of 123917929 is 929719321.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121881600 + 2036329 = 11040^2 + 1427^2 .

It is a cyclic number.

It is not a de Polignac number, because 123917929 - 2¹⁷ = 123786857 is a prime.

It is not a weakly prime, because it can be changed into another prime (123917923) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61958964 + 61958965.

It is an arithmetic number, because the mean of its divisors is an integer number (61958965).

Almost surely, 2^123917929 is an apocalyptic number.

It is an amenable number.

123917929 is a deficient number, since it is larger than the sum of its proper divisors (1).

123917929 is an equidigital number, since it uses as much as digits as its factorization.

123917929 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 61236, while the sum is 43.

The square root of 123917929 is about 11131.8430190153. The cubic root of 123917929 is about 498.5530554086.

The spelling of 123917929 in words is "one hundred twenty-three million, nine hundred seventeen thousand, nine hundred twenty-nine".