2138799397 has 4 divisors (see below), whose sum is σ = 2444342176. Its totient is φ = 1833256620.

The previous prime is 2138799379. The next prime is 2138799401. The reversal of 2138799397 is 7939978312.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2138799397 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2138799307) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 152771379 + ... + 152771392.

It is an arithmetic number, because the mean of its divisors is an integer number (611085544).

Almost surely, 2^2138799397 is an apocalyptic number.

It is an amenable number.

2138799397 is a deficient number, since it is larger than the sum of its proper divisors (305542779).

2138799397 is an equidigital number, since it uses as much as digits as its factorization.

2138799397 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 305542778.

The product of its digits is 5143824, while the sum is 58.

The square root of 2138799397 is about 46247.1555557745. The cubic root of 2138799397 is about 1288.4177056296.

The spelling of 2138799397 in words is "two billion, one hundred thirty-eight million, seven hundred ninety-nine thousand, three hundred ninety-seven".