23721649 has 8 divisors (see below), whose sum is σ = 27437760. Its totient is φ = 20087376.

The previous prime is 23721637. The next prime is 23721653. The reversal of 23721649 is 94612732.

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 23721649 - 2⁷ = 23721521 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23721629) 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, 19834 + ... + 20995.

It is an arithmetic number, because the mean of its divisors is an integer number (3429720).

Almost surely, 2^23721649 is an apocalyptic number.

It is an amenable number.

23721649 is a deficient number, since it is larger than the sum of its proper divisors (3716111).

23721649 is an equidigital number, since it uses as much as digits as its factorization.

23721649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40919.

The product of its digits is 18144, while the sum is 34.

The square root of 23721649 is about 4870.4875525968. The cubic root of 23721649 is about 287.3304315767.

The spelling of 23721649 in words is "twenty-three million, seven hundred twenty-one thousand, six hundred forty-nine".