23655409 has 2 divisors, whose sum is σ = 23655410. Its totient is φ = 23655408.

The previous prime is 23655407. The next prime is 23655419. The reversal of 23655409 is 90455632.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 12285025 + 11370384 = 3505^2 + 3372^2 .

It is a cyclic number.

It is not a de Polignac number, because 23655409 - 2¹ = 23655407 is a prime.

Together with 23655407, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (23655407) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11827704 + 11827705.

It is an arithmetic number, because the mean of its divisors is an integer number (11827705).

Almost surely, 2^23655409 is an apocalyptic number.

It is an amenable number.

23655409 is a deficient number, since it is larger than the sum of its proper divisors (1).

23655409 is an equidigital number, since it uses as much as digits as its factorization.

23655409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 32400, while the sum is 34.

The square root of 23655409 is about 4863.6826582334. The cubic root of 23655409 is about 287.0627364299.

The spelling of 23655409 in words is "twenty-three million, six hundred fifty-five thousand, four hundred nine".