2138998847 has 2 divisors, whose sum is σ = 2138998848. Its totient is φ = 2138998846.

The previous prime is 2138998831. The next prime is 2138998879. The reversal of 2138998847 is 7488998312.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2138998847 - 2⁴ = 2138998831 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2138998817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1069499423 + 1069499424.

It is an arithmetic number, because the mean of its divisors is an integer number (1069499424).

Almost surely, 2^2138998847 is an apocalyptic number.

2138998847 is a deficient number, since it is larger than the sum of its proper divisors (1).

2138998847 is an equidigital number, since it uses as much as digits as its factorization.

2138998847 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6967296, while the sum is 59.

The square root of 2138998847 is about 46249.3118543401. The cubic root of 2138998847 is about 1288.4577540986.

The spelling of 2138998847 in words is "two billion, one hundred thirty-eight million, nine hundred ninety-eight thousand, eight hundred forty-seven".