2139705878 has 8 divisors (see below), whose sum is σ = 3209985768. Its totient is φ = 1069710624.

The previous prime is 2139705863. The next prime is 2139705941. The reversal of 2139705878 is 8785079312.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 51251 + ... + 83102.

It is an arithmetic number, because the mean of its divisors is an integer number (401248221).

Almost surely, 2^2139705878 is an apocalyptic number.

2139705878 is a deficient number, since it is larger than the sum of its proper divisors (1070279890).

2139705878 is a wasteful number, since it uses less digits than its factorization.

2139705878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 142318.

The product of its (nonzero) digits is 846720, while the sum is 50.

The square root of 2139705878 is about 46256.9549149098. The cubic root of 2139705878 is about 1288.5997020044.

The spelling of 2139705878 in words is "two billion, one hundred thirty-nine million, seven hundred five thousand, eight hundred seventy-eight".