23198409 has 12 divisors (see below), whose sum is σ = 36086596. Its totient is φ = 14275872.

The previous prime is 23198389. The next prime is 23198443. The reversal of 23198409 is 90489132.

It can be written as a sum of positive squares in 2 ways, for example, as 2295225 + 20903184 = 1515^2 + 4572^2 .

It is not a de Polignac number, because 23198409 - 2⁹ = 23197897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (23198479) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 99022 + ... + 99255.

Almost surely, 2^23198409 is an apocalyptic number.

It is an amenable number.

23198409 is a deficient number, since it is larger than the sum of its proper divisors (12888187).

23198409 is a wasteful number, since it uses less digits than its factorization.

23198409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198296 (or 198293 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 23198409 is about 4816.4726719873. The cubic root of 23198409 is about 285.2021096397.

The spelling of 23198409 in words is "twenty-three million, one hundred ninety-eight thousand, four hundred nine".