23721629 has 2 divisors, whose sum is σ = 23721630. Its totient is φ = 23721628.

The previous prime is 23721589. The next prime is 23721637. The reversal of 23721629 is 92612732.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18292729 + 5428900 = 4277^2 + 2330^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23721629 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 23721595 and 23721604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (23721689) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11860814 + 11860815.

It is an arithmetic number, because the mean of its divisors is an integer number (11860815).

Almost surely, 2^23721629 is an apocalyptic number.

It is an amenable number.

23721629 is a deficient number, since it is larger than the sum of its proper divisors (1).

23721629 is an equidigital number, since it uses as much as digits as its factorization.

23721629 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9072, while the sum is 32.

The square root of 23721629 is about 4870.4854994138. The cubic root of 23721629 is about 287.3303508261.

The spelling of 23721629 in words is "twenty-three million, seven hundred twenty-one thousand, six hundred twenty-nine".