9138399 has 4 divisors (see below), whose sum is σ = 12184536. Its totient is φ = 6092264.

The previous prime is 9138347. The next prime is 9138413. The reversal of 9138399 is 9938319.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9138399 - 2⁷ = 9138271 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 9138399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9138329) 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, 1523064 + ... + 1523069.

It is an arithmetic number, because the mean of its divisors is an integer number (3046134).

Almost surely, 2^9138399 is an apocalyptic number.

9138399 is a deficient number, since it is larger than the sum of its proper divisors (3046137).

9138399 is a wasteful number, since it uses less digits than its factorization.

9138399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3046136.

The product of its digits is 52488, while the sum is 42.

The square root of 9138399 is about 3022.9784981041. The cubic root of 9138399 is about 209.0691910134.

The spelling of 9138399 in words is "nine million, one hundred thirty-eight thousand, three hundred ninety-nine".