2139778371 has 8 divisors (see below), whose sum is σ = 2873563840. Its totient is φ = 1416255912.

The previous prime is 2139778327. The next prime is 2139778391. The reversal of 2139778371 is 1738779312.

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

It is not a de Polignac number, because 2139778371 - 2⁷ = 2139778243 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2139778371.

It is not an unprimeable number, because it can be changed into a prime (2139778391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2565265 + ... + 2566098.

It is an arithmetic number, because the mean of its divisors is an integer number (359195480).

Almost surely, 2^2139778371 is an apocalyptic number.

2139778371 is a deficient number, since it is larger than the sum of its proper divisors (733785469).

2139778371 is a wasteful number, since it uses less digits than its factorization.

2139778371 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5131505.

The product of its digits is 444528, while the sum is 48.

The square root of 2139778371 is about 46257.7384985475. The cubic root of 2139778371 is about 1288.6142543788.

The spelling of 2139778371 in words is "two billion, one hundred thirty-nine million, seven hundred seventy-eight thousand, three hundred seventy-one".