2139173278 has 48 divisors (see below), whose sum is σ = 3711293712. Its totient is φ = 922838400.

The previous prime is 2139173269. The next prime is 2139173279. The reversal of 2139173278 is 8723719312.

It is a Smith number, since the sum of its digits (43) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2139173279) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 364201 + ... + 370027.

It is an arithmetic number, because the mean of its divisors is an integer number (77318619).

Almost surely, 2^2139173278 is an apocalyptic number.

2139173278 is a deficient number, since it is larger than the sum of its proper divisors (1572120434).

2139173278 is a wasteful number, since it uses less digits than its factorization.

2139173278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5929 (or 5918 counting only the distinct ones).

The product of its digits is 127008, while the sum is 43.

The square root of 2139173278 is about 46251.1975844950. The cubic root of 2139173278 is about 1288.4927768486.

The spelling of 2139173278 in words is "two billion, one hundred thirty-nine million, one hundred seventy-three thousand, two hundred seventy-eight".