2139784655 has 8 divisors (see below), whose sum is σ = 2702886000. Its totient is φ = 1621731456.

The previous prime is 2139784627. The next prime is 2139784667. The reversal of 2139784655 is 5564879312.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 2139784655 - 2⁸ = 2139784399 is a prime.

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, 11261930 + ... + 11262119.

It is an arithmetic number, because the mean of its divisors is an integer number (337860750).

Almost surely, 2^2139784655 is an apocalyptic number.

2139784655 is a deficient number, since it is larger than the sum of its proper divisors (563101345).

2139784655 is a wasteful number, since it uses less digits than its factorization.

2139784655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22524073.

The product of its digits is 1814400, while the sum is 50.

The square root of 2139784655 is about 46257.8064222678. The cubic root of 2139784655 is about 1288.6155158247.

The spelling of 2139784655 in words is "two billion, one hundred thirty-nine million, seven hundred eighty-four thousand, six hundred fifty-five".