2138779206 has 12 divisors (see below), whose sum is σ = 4634021652. Its totient is φ = 712926396.

The previous prime is 2138779151. The next prime is 2138779219. The reversal of 2138779206 is 6029778312.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 59410516 + ... + 59410551.

It is an arithmetic number, because the mean of its divisors is an integer number (386168471).

Almost surely, 2^2138779206 is an apocalyptic number.

2138779206 is an abundant number, since it is smaller than the sum of its proper divisors (2495242446).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2138779206 is a wasteful number, since it uses less digits than its factorization.

2138779206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118821075 (or 118821072 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The square root of 2138779206 is about 46246.9372607527. The cubic root of 2138779206 is about 1288.4136512485.

The spelling of 2138779206 in words is "two billion, one hundred thirty-eight million, seven hundred seventy-nine thousand, two hundred six".