23666403 has 4 divisors (see below), whose sum is σ = 31555208. Its totient is φ = 15777600.

The previous prime is 23666387. The next prime is 23666411. The reversal of 23666403 is 30466632.

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

It is not a de Polignac number, because 23666403 - 2⁴ = 23666387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23666443) 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, 3944398 + ... + 3944403.

It is an arithmetic number, because the mean of its divisors is an integer number (7888802).

Almost surely, 2^23666403 is an apocalyptic number.

23666403 is a deficient number, since it is larger than the sum of its proper divisors (7888805).

23666403 is an equidigital number, since it uses as much as digits as its factorization.

23666403 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7888804.

The product of its (nonzero) digits is 15552, while the sum is 30.

The square root of 23666403 is about 4864.8127404865. The cubic root of 23666403 is about 287.1072009458.

The spelling of 23666403 in words is "twenty-three million, six hundred sixty-six thousand, four hundred three".