23006405 has 8 divisors (see below), whose sum is σ = 27768312. Its totient is φ = 18298048.

The previous prime is 23006369. The next prime is 23006407. The reversal of 23006405 is 50460032.

It can be written as a sum of positive squares in 4 ways, for example, as 11710084 + 11296321 = 3422^2 + 3361^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 23006405 - 2⁸ = 23006149 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 (23006407) 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 7 ways as a sum of consecutive naturals, for example, 12434 + ... + 14163.

It is an arithmetic number, because the mean of its divisors is an integer number (3471039).

Almost surely, 2^23006405 is an apocalyptic number.

It is an amenable number.

23006405 is a deficient number, since it is larger than the sum of its proper divisors (4761907).

23006405 is a wasteful number, since it uses less digits than its factorization.

23006405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26775.

The product of its (nonzero) digits is 720, while the sum is 20.

The square root of 23006405 is about 4796.4992442405. The cubic root of 23006405 is about 284.4130940394.

Adding to 23006405 its reverse (50460032), we get a palindrome (73466437).

The spelling of 23006405 in words is "twenty-three million, six thousand, four hundred five".