23621729 has 8 divisors (see below), whose sum is σ = 24169320. Its totient is φ = 23078016.

The previous prime is 23621723. The next prime is 23621743. The reversal of 23621729 is 92712632.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 8567329 + 15054400 = 2927^2 + 3880^2 .

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 23621729 - 2¹⁶ = 23556193 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23621695 and 23621704.

It is not an unprimeable number, because it can be changed into a prime (23621723) 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, 13877 + ... + 15485.

It is an arithmetic number, because the mean of its divisors is an integer number (3021165).

Almost surely, 2^23621729 is an apocalyptic number.

It is an amenable number.

23621729 is a deficient number, since it is larger than the sum of its proper divisors (547591).

23621729 is a wasteful number, since it uses less digits than its factorization.

23621729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1939.

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

The square root of 23621729 is about 4860.2190279863. The cubic root of 23621729 is about 286.9264340578.

The spelling of 23621729 in words is "twenty-three million, six hundred twenty-one thousand, seven hundred twenty-nine".