23138409 has 16 divisors (see below), whose sum is σ = 37114880. Its totient is φ = 12525840.

The previous prime is 23138407. The next prime is 23138417. The reversal of 23138409 is 90483132.

It is not a de Polignac number, because 23138409 - 2¹ = 23138407 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (23138407) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 28597 + ... + 29394.

It is an arithmetic number, because the mean of its divisors is an integer number (2319680).

Almost surely, 2^23138409 is an apocalyptic number.

It is an amenable number.

23138409 is a deficient number, since it is larger than the sum of its proper divisors (13976471).

23138409 is a wasteful number, since it uses less digits than its factorization.

23138409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58020.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 23138409 is about 4810.2400148018. The cubic root of 23138409 is about 284.9560166043.

The spelling of 23138409 in words is "twenty-three million, one hundred thirty-eight thousand, four hundred nine".