2123778679 has 4 divisors (see below), whose sum is σ = 2316849480. Its totient is φ = 1930707880.

The previous prime is 2123778677. The next prime is 2123778689. The reversal of 2123778679 is 9768773212.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 2123778679 - 2¹ = 2123778677 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2123778677) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 96535384 + ... + 96535405.

It is an arithmetic number, because the mean of its divisors is an integer number (579212370).

Almost surely, 2^2123778679 is an apocalyptic number.

2123778679 is a deficient number, since it is larger than the sum of its proper divisors (193070801).

2123778679 is a wasteful number, since it uses less digits than its factorization.

2123778679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 193070800.

The product of its digits is 1778112, while the sum is 52.

The square root of 2123778679 is about 46084.4732963283. The cubic root of 2123778679 is about 1285.3944453664.

The spelling of 2123778679 in words is "two billion, one hundred twenty-three million, seven hundred seventy-eight thousand, six hundred seventy-nine".