23440031 has 4 divisors (see below), whose sum is σ = 23985192. Its totient is φ = 22894872.

The previous prime is 23440003. The next prime is 23440037. The reversal of 23440031 is 13004432.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-23440031 is a prime.

It is a super-2 number, since 2×23440031² = 1098870106561922, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23439991 and 23440009.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23440037) 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, 272516 + ... + 272601.

It is an arithmetic number, because the mean of its divisors is an integer number (5996298).

Almost surely, 2^23440031 is an apocalyptic number.

23440031 is a deficient number, since it is larger than the sum of its proper divisors (545161).

23440031 is an equidigital number, since it uses as much as digits as its factorization.

23440031 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 545160.

The product of its (nonzero) digits is 288, while the sum is 17.

The square root of 23440031 is about 4841.4905762585. The cubic root of 23440031 is about 286.1888616782.

Adding to 23440031 its reverse (13004432), we get a palindrome (36444463).

The spelling of 23440031 in words is "twenty-three million, four hundred forty thousand, thirty-one".