2138789 has 2 divisors, whose sum is σ = 2138790. Its totient is φ = 2138788.

The previous prime is 2138749. The next prime is 2138797. The reversal of 2138789 is 9878312.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1221025 + 917764 = 1105^2 + 958^2 .

It is a cyclic number.

It is not a de Polignac number, because 2138789 - 2²⁰ = 1090213 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2138749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1069394 + 1069395.

It is an arithmetic number, because the mean of its divisors is an integer number (1069395).

2^2138789 is an apocalyptic number.

It is an amenable number.

2138789 is a deficient number, since it is larger than the sum of its proper divisors (1).

2138789 is an equidigital number, since it uses as much as digits as its factorization.

2138789 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 2138789 is about 1462.4599139806. The cubic root of 2138789 is about 128.8415617901.

The spelling of 2138789 in words is "two million, one hundred thirty-eight thousand, seven hundred eighty-nine".