2138399 has 2 divisors, whose sum is σ = 2138400. Its totient is φ = 2138398.

The previous prime is 2138387. The next prime is 2138401. The reversal of 2138399 is 9938312.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2138399 - 2¹² = 2134303 is a prime.

It is a Sophie Germain prime.

Together with 2138401, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 6.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2138999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1069199 + 1069200.

It is an arithmetic number, because the mean of its divisors is an integer number (1069200).

2^2138399 is an apocalyptic number.

2138399 is a deficient number, since it is larger than the sum of its proper divisors (1).

2138399 is an equidigital number, since it uses as much as digits as its factorization.

2138399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 11664, while the sum is 35.

The square root of 2138399 is about 1462.3265709136. The cubic root of 2138399 is about 128.8337300586.

The spelling of 2138399 in words is "two million, one hundred thirty-eight thousand, three hundred ninety-nine".