23438209 has 2 divisors, whose sum is σ = 23438210. Its totient is φ = 23438208.

The previous prime is 23438197. The next prime is 23438221. The reversal of 23438209 is 90283432.

It is a balanced prime because it is at equal distance from previous prime (23438197) and next prime (23438221).

It can be written as a sum of positive squares in only one way, i.e., 21344400 + 2093809 = 4620^2 + 1447^2 .

It is a cyclic number.

It is not a de Polignac number, because 23438209 - 2¹⁹ = 22913921 is a prime.

It is a super-2 number, since 2×23438209² = 1098699282255362, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (23438269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11719104 + 11719105.

It is an arithmetic number, because the mean of its divisors is an integer number (11719105).

Almost surely, 2^23438209 is an apocalyptic number.

It is an amenable number.

23438209 is a deficient number, since it is larger than the sum of its proper divisors (1).

23438209 is an equidigital number, since it uses as much as digits as its factorization.

23438209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 23438209 is about 4841.3024074106. The cubic root of 23438209 is about 286.1814463067.

The spelling of 23438209 in words is "twenty-three million, four hundred thirty-eight thousand, two hundred nine".