23746721 has 4 divisors (see below), whose sum is σ = 23898132. Its totient is φ = 23595312.

The previous prime is 23746693. The next prime is 23746727. The reversal of 23746721 is 12764732.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14167696 + 9579025 = 3764^2 + 3095^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23746721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23746727) 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 3 ways as a sum of consecutive naturals, for example, 75470 + ... + 75783.

It is an arithmetic number, because the mean of its divisors is an integer number (5974533).

Almost surely, 2^23746721 is an apocalyptic number.

It is an amenable number.

23746721 is a deficient number, since it is larger than the sum of its proper divisors (151411).

23746721 is a wasteful number, since it uses less digits than its factorization.

23746721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151410.

The product of its digits is 14112, while the sum is 32.

The square root of 23746721 is about 4873.0607424903. The cubic root of 23746721 is about 287.4316248237.

The spelling of 23746721 in words is "twenty-three million, seven hundred forty-six thousand, seven hundred twenty-one".