23966521 has 8 divisors (see below), whose sum is σ = 24247944. Its totient is φ = 23687040.

The previous prime is 23966513. The next prime is 23966531. The reversal of 23966521 is 12566932.

It can be written as a sum of positive squares in 4 ways, for example, as 4562496 + 19404025 = 2136^2 + 4405^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 23966521 - 2³ = 23966513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23966531) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45741 + ... + 46261.

It is an arithmetic number, because the mean of its divisors is an integer number (3030993).

Almost surely, 2^23966521 is an apocalyptic number.

It is an amenable number.

23966521 is a deficient number, since it is larger than the sum of its proper divisors (281423).

23966521 is a wasteful number, since it uses less digits than its factorization.

23966521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 971.

The product of its digits is 19440, while the sum is 34.

The square root of 23966521 is about 4895.5613569845. The cubic root of 23966521 is about 288.3157264430.

The spelling of 23966521 in words is "twenty-three million, nine hundred sixty-six thousand, five hundred twenty-one".