23403997 has 4 divisors (see below), whose sum is σ = 23948320. Its totient is φ = 22859676.

The previous prime is 23403983. The next prime is 23404001. The reversal of 23403997 is 79930432.

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-23403997 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 (23403937) 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, 272097 + ... + 272182.

It is an arithmetic number, because the mean of its divisors is an integer number (5987080).

Almost surely, 2^23403997 is an apocalyptic number.

It is an amenable number.

23403997 is a deficient number, since it is larger than the sum of its proper divisors (544323).

23403997 is an equidigital number, since it uses as much as digits as its factorization.

23403997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 544322.

The product of its (nonzero) digits is 40824, while the sum is 37.

The square root of 23403997 is about 4837.7677703668. The cubic root of 23403997 is about 286.0421352171.

The spelling of 23403997 in words is "twenty-three million, four hundred three thousand, nine hundred ninety-seven".