12138399 has 24 divisors (see below), whose sum is σ = 21580832. Its totient is φ = 6402240.

The previous prime is 12138389. The next prime is 12138409. The reversal of 12138399 is 99383121.

12138399 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (12138389) and next prime (12138409).

It is not a de Polignac number, because 12138399 - 2⁴ = 12138383 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12138389) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6592 + ... + 8229.

Almost surely, 2^12138399 is an apocalyptic number.

12138399 is a deficient number, since it is larger than the sum of its proper divisors (9442433).

12138399 is a wasteful number, since it uses less digits than its factorization.

12138399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14847 (or 14844 counting only the distinct ones).

The product of its digits is 11664, while the sum is 36.

The square root of 12138399 is about 3484.0205223276. The cubic root of 12138399 is about 229.8196380584.

The spelling of 12138399 in words is "twelve million, one hundred thirty-eight thousand, three hundred ninety-nine".