23503993 has 4 divisors (see below), whose sum is σ = 23527168. Its totient is φ = 23480820.

The previous prime is 23503981. The next prime is 23504011. The reversal of 23503993 is 39930532.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23503993 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23503903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9993 + ... + 12118.

It is an arithmetic number, because the mean of its divisors is an integer number (5881792).

Almost surely, 2^23503993 is an apocalyptic number.

It is an amenable number.

23503993 is a deficient number, since it is larger than the sum of its proper divisors (23175).

23503993 is a wasteful number, since it uses less digits than its factorization.

23503993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23174.

The product of its (nonzero) digits is 21870, while the sum is 34.

The square root of 23503993 is about 4848.0916864267. The cubic root of 23503993 is about 286.4489379418.

The spelling of 23503993 in words is "twenty-three million, five hundred three thousand, nine hundred ninety-three".