2139878708 has 18 divisors (see below), whose sum is σ = 4116172578. Its totient is φ = 972671920.

The previous prime is 2139878707. The next prime is 2139878731. The reversal of 2139878708 is 8078789312.

It can be written as a sum of positive squares in only one way, i.e., 2065884304 + 73994404 = 45452^2 + 8602^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 2139878708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2139878707) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2210135 + ... + 2211102.

Almost surely, 2^2139878708 is an apocalyptic number.

It is an amenable number.

2139878708 is a deficient number, since it is larger than the sum of its proper divisors (1976293870).

2139878708 is a wasteful number, since it uses less digits than its factorization.

2139878708 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4421263 (or 4421250 counting only the distinct ones).

The product of its (nonzero) digits is 1354752, while the sum is 53.

The square root of 2139878708 is about 46258.8230286937. The cubic root of 2139878708 is about 1288.6343956653.

The spelling of 2139878708 in words is "two billion, one hundred thirty-nine million, eight hundred seventy-eight thousand, seven hundred eight".