23213729 has 12 divisors (see below), whose sum is σ = 29162112. Its totient is φ = 18087960.

The previous prime is 23213719. The next prime is 23213731. The reversal of 23213729 is 92731232.

It is not a de Polignac number, because 23213729 - 2⁸ = 23213473 is a prime.

It is a hoax number, since the sum of its digits (29) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23213719) 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 in 11 ways as a sum of consecutive naturals, for example, 12857 + ... + 14550.

It is an arithmetic number, because the mean of its divisors is an integer number (2430176).

Almost surely, 2^23213729 is an apocalyptic number.

It is an amenable number.

23213729 is a deficient number, since it is larger than the sum of its proper divisors (5948383).

23213729 is a wasteful number, since it uses less digits than its factorization.

23213729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27436 (or 27425 counting only the distinct ones).

The product of its digits is 4536, while the sum is 29.

The square root of 23213729 is about 4818.0627849790. The cubic root of 23213729 is about 285.2648773760.

The spelling of 23213729 in words is "twenty-three million, two hundred thirteen thousand, seven hundred twenty-nine".