23040013 has 4 divisors (see below), whose sum is σ = 23074048. Its totient is φ = 23005980.

The previous prime is 23039993. The next prime is 23040023. The reversal of 23040013 is 31004032.

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 not a de Polignac number, because 23040013 - 2⁹ = 23039501 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 23039975 and 23040002.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (23040023) 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, 15981 + ... + 17362.

It is an arithmetic number, because the mean of its divisors is an integer number (5768512).

Almost surely, 2^23040013 is an apocalyptic number.

It is an amenable number.

23040013 is a deficient number, since it is larger than the sum of its proper divisors (34035).

23040013 is an equidigital number, since it uses as much as digits as its factorization.

23040013 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34034.

The product of its (nonzero) digits is 72, while the sum is 13.

The square root of 23040013 is about 4800.0013541665. The cubic root of 23040013 is about 284.5515178773.

Subtracting from 23040013 its sum of digits (13), we obtain a square (23040000 = 4800²).

Adding to 23040013 its reverse (31004032), we get a palindrome (54044045).

The spelling of 23040013 in words is "twenty-three million, forty thousand, thirteen".