2138879 has 2 divisors, whose sum is σ = 2138880. Its totient is φ = 2138878.

The previous prime is 2138867. The next prime is 2138897. The reversal of 2138879 is 9788312.

Together with next prime (2138897) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2138879 - 2⁸ = 2138623 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2134879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1069439 + 1069440.

It is an arithmetic number, because the mean of its divisors is an integer number (1069440).

2^2138879 is an apocalyptic number.

2138879 is a deficient number, since it is larger than the sum of its proper divisors (1).

2138879 is an equidigital number, since it uses as much as digits as its factorization.

2138879 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 38.

The square root of 2138879 is about 1462.4906837310. The cubic root of 2138879 is about 128.8433689775.

The spelling of 2138879 in words is "two million, one hundred thirty-eight thousand, eight hundred seventy-nine".