23217407 has 4 divisors (see below), whose sum is σ = 23247336. Its totient is φ = 23187480.

The previous prime is 23217391. The next prime is 23217409. The reversal of 23217407 is 70471232.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 23217407 - 2⁴ = 23217391 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23217409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13769 + ... + 15362.

It is an arithmetic number, because the mean of its divisors is an integer number (5811834).

Almost surely, 2^23217407 is an apocalyptic number.

23217407 is a deficient number, since it is larger than the sum of its proper divisors (29929).

23217407 is an equidigital number, since it uses as much as digits as its factorization.

23217407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29928.

The product of its (nonzero) digits is 2352, while the sum is 26.

The square root of 23217407 is about 4818.4444585364. Note that the first 4 decimals coincide. The cubic root of 23217407 is about 285.2799424382.

Adding to 23217407 its reverse (70471232), we get a palindrome (93688639).

The spelling of 23217407 in words is "twenty-three million, two hundred seventeen thousand, four hundred seven".