23453209 has 4 divisors (see below), whose sum is σ = 25257316. Its totient is φ = 21649104.

The previous prime is 23453179. The next prime is 23453233. The reversal of 23453209 is 90235432.

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 1625625 + 21827584 = 1275^2 + 4672^2 .

It is a cyclic number.

It is not a de Polignac number, because 23453209 - 2¹⁹ = 22928921 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23453249) 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, 902034 + ... + 902059.

It is an arithmetic number, because the mean of its divisors is an integer number (6314329).

Almost surely, 2^23453209 is an apocalyptic number.

It is an amenable number.

23453209 is a deficient number, since it is larger than the sum of its proper divisors (1804107).

23453209 is a wasteful number, since it uses less digits than its factorization.

23453209 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1804106.

The product of its (nonzero) digits is 6480, while the sum is 28.

The square root of 23453209 is about 4842.8513295372. The cubic root of 23453209 is about 286.2424834827.

The spelling of 23453209 in words is "twenty-three million, four hundred fifty-three thousand, two hundred nine".