23828409 has 18 divisors (see below), whose sum is σ = 37833978. Its totient is φ = 14440800.

The previous prime is 23828383. The next prime is 23828411. The reversal of 23828409 is 90482832.

It can be written as a sum of positive squares in only one way, i.e., 12938409 + 10890000 = 3597^2 + 3300^2 .

It is not a de Polignac number, because 23828409 - 2⁷ = 23828281 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23828449) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 9852 + ... + 12029.

Almost surely, 2^23828409 is an apocalyptic number.

It is an amenable number.

23828409 is a deficient number, since it is larger than the sum of its proper divisors (14005569).

23828409 is a wasteful number, since it uses less digits than its factorization.

23828409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21909 (or 21895 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 23828409 is about 4881.4351373341. The cubic root of 23828409 is about 287.7608329802.

The spelling of 23828409 in words is "twenty-three million, eight hundred twenty-eight thousand, four hundred nine".