23643409 has 2 divisors, whose sum is σ = 23643410. Its totient is φ = 23643408.

The previous prime is 23643401. The next prime is 23643419. The reversal of 23643409 is 90434632.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15233409 + 8410000 = 3903^2 + 2900^2 .

It is a cyclic number.

It is not a de Polignac number, because 23643409 - 2³ = 23643401 is a prime.

It is not a weakly prime, because it can be changed into another prime (23643401) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11821704 + 11821705.

It is an arithmetic number, because the mean of its divisors is an integer number (11821705).

Almost surely, 2^23643409 is an apocalyptic number.

It is an amenable number.

23643409 is a deficient number, since it is larger than the sum of its proper divisors (1).

23643409 is an equidigital number, since it uses as much as digits as its factorization.

23643409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15552, while the sum is 31.

The square root of 23643409 is about 4862.4488686258. The cubic root of 23643409 is about 287.0141874843.

The spelling of 23643409 in words is "twenty-three million, six hundred forty-three thousand, four hundred nine".