23217530 has 32 divisors (see below), whose sum is σ = 48784896. Its totient is φ = 7789824.

The previous prime is 23217479. The next prime is 23217533. The reversal of 23217530 is 3571232.

It is a junction number, because it is equal to n+sod(n) for n = 23217496 and 23217505.

It is not an unprimeable number, because it can be changed into a prime (23217533) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 239 + ... + 6818.

It is an arithmetic number, because the mean of its divisors is an integer number (1524528).

Almost surely, 2^23217530 is an apocalyptic number.

23217530 is an abundant number, since it is smaller than the sum of its proper divisors (25567366).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

23217530 is a wasteful number, since it uses less digits than its factorization.

23217530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7118.

The product of its (nonzero) digits is 1260, while the sum is 23.

The square root of 23217530 is about 4818.4572219747. The cubic root of 23217530 is about 285.2804462178.

Adding to 23217530 its reverse (3571232), we get a palindrome (26788762).

The spelling of 23217530 in words is "twenty-three million, two hundred seventeen thousand, five hundred thirty".