23390209 has 4 divisors (see below), whose sum is σ = 23597316. Its totient is φ = 23183104.

The previous prime is 23390183. The next prime is 23390221. The reversal of 23390209 is 90209332.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3783025 + 19607184 = 1945^2 + 4428^2 .

It is a cyclic number.

It is not a de Polignac number, because 23390209 - 2¹³ = 23382017 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23390239) 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, 103384 + ... + 103609.

It is an arithmetic number, because the mean of its divisors is an integer number (5899329).

Almost surely, 2^23390209 is an apocalyptic number.

It is an amenable number.

23390209 is a deficient number, since it is larger than the sum of its proper divisors (207107).

23390209 is a wasteful number, since it uses less digits than its factorization.

23390209 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 207106.

The product of its (nonzero) digits is 2916, while the sum is 28.

The square root of 23390209 is about 4836.3425230230. The cubic root of 23390209 is about 285.9859521683.

The spelling of 23390209 in words is "twenty-three million, three hundred ninety thousand, two hundred nine".