23408729 has 2 divisors, whose sum is σ = 23408730. Its totient is φ = 23408728.

The previous prime is 23408717. The next prime is 23408743. The reversal of 23408729 is 92780432.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 20912329 + 2496400 = 4573^2 + 1580^2 .

It is a cyclic number.

It is not a de Polignac number, because 23408729 - 2²⁰ = 22360153 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (23408789) 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, 11704364 + 11704365.

It is an arithmetic number, because the mean of its divisors is an integer number (11704365).

Almost surely, 2^23408729 is an apocalyptic number.

It is an amenable number.

23408729 is a deficient number, since it is larger than the sum of its proper divisors (1).

23408729 is an equidigital number, since it uses as much as digits as its factorization.

23408729 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 23408729 is about 4838.2568141842. The cubic root of 23408729 is about 286.0614119838.

The spelling of 23408729 in words is "twenty-three million, four hundred eight thousand, seven hundred twenty-nine".