2138789423 has 2 divisors, whose sum is σ = 2138789424. Its totient is φ = 2138789422.

The previous prime is 2138789399. The next prime is 2138789449. The reversal of 2138789423 is 3249878312.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2138789423 - 2⁸ = 2138789167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2138789453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1069394711 + 1069394712.

It is an arithmetic number, because the mean of its divisors is an integer number (1069394712).

Almost surely, 2^2138789423 is an apocalyptic number.

2138789423 is a deficient number, since it is larger than the sum of its proper divisors (1).

2138789423 is an equidigital number, since it uses as much as digits as its factorization.

2138789423 is an evil number, because the sum of its binary digits is even.

The product of its digits is 580608, while the sum is 47.

The square root of 2138789423 is about 46247.0477219898. The cubic root of 2138789423 is about 1288.4157028396.

Subtracting 2138789423 from its reverse (3249878312), we obtain a square (1111088889 = 33333²).

The spelling of 2138789423 in words is "two billion, one hundred thirty-eight million, seven hundred eighty-nine thousand, four hundred twenty-three".