123623729 has 2 divisors, whose sum is σ = 123623730. Its totient is φ = 123623728.

The previous prime is 123623707. The next prime is 123623737. The reversal of 123623729 is 927326321.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 90250000 + 33373729 = 9500^2 + 5777^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-123623729 is a prime.

It is not a weakly prime, because it can be changed into another prime (123623789) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 61811864 + 61811865.

It is an arithmetic number, because the mean of its divisors is an integer number (61811865).

Almost surely, 2^123623729 is an apocalyptic number.

It is an amenable number.

123623729 is a deficient number, since it is larger than the sum of its proper divisors (1).

123623729 is an equidigital number, since it uses as much as digits as its factorization.

123623729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 35.

The square root of 123623729 is about 11118.6208227460. The cubic root of 123623729 is about 498.1581958454.

The spelling of 123623729 in words is "one hundred twenty-three million, six hundred twenty-three thousand, seven hundred twenty-nine".