2138999 has 2 divisors, whose sum is σ = 2139000. Its totient is φ = 2138998.

The previous prime is 2138989. The next prime is 2139013. The reversal of 2138999 is 9998312.

2138999 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2138999 - 2⁸ = 2138743 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2138909) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1069499 + 1069500.

It is an arithmetic number, because the mean of its divisors is an integer number (1069500).

2^2138999 is an apocalyptic number.

2138999 is a deficient number, since it is larger than the sum of its proper divisors (1).

2138999 is an equidigital number, since it uses as much as digits as its factorization.

2138999 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 34992, while the sum is 41.

The square root of 2138999 is about 1462.5317090580. The cubic root of 2138999 is about 128.8457784819.

The spelling of 2138999 in words is "two million, one hundred thirty-eight thousand, nine hundred ninety-nine".