2139823278 has 16 divisors (see below), whose sum is σ = 4755162960. Its totient is φ = 713274408.

The previous prime is 2139823247. The next prime is 2139823297. The reversal of 2139823278 is 8723289312.

2139823278 is a `hidden beast` number, since 21 + 398 + 232 + 7 + 8 = 666.

It is a super-2 number, since 2×2139823278² = 9157687322141330568, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19813125 + ... + 19813232.

It is an arithmetic number, because the mean of its divisors is an integer number (297197685).

Almost surely, 2^2139823278 is an apocalyptic number.

2139823278 is an abundant number, since it is smaller than the sum of its proper divisors (2615339682).

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

2139823278 is a wasteful number, since it uses less digits than its factorization.

2139823278 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39626368 (or 39626362 counting only the distinct ones).

The product of its digits is 290304, while the sum is 45.

The square root of 2139823278 is about 46258.2238958653. The cubic root of 2139823278 is about 1288.6232689254.

The spelling of 2139823278 in words is "two billion, one hundred thirty-nine million, eight hundred twenty-three thousand, two hundred seventy-eight".