2129873978 has 8 divisors (see below), whose sum is σ = 3195338772. Its totient is φ = 1064761056.

The previous prime is 2129873969. The next prime is 2129873983. The reversal of 2129873978 is 8793789212.

It can be written as a sum of positive squares in 2 ways, for example, as 1893729289 + 236144689 = 43517^2 + 15367^2 .

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

It is a Curzon 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 3 ways as a sum of consecutive naturals, for example, 72275 + ... + 97382.

Almost surely, 2^2129873978 is an apocalyptic number.

2129873978 is a deficient number, since it is larger than the sum of its proper divisors (1065464794).

2129873978 is a wasteful number, since it uses less digits than its factorization.

2129873978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 175936.

The product of its digits is 3048192, while the sum is 56.

The square root of 2129873978 is about 46150.5577214404. The cubic root of 2129873978 is about 1286.6229757626.

The spelling of 2129873978 in words is "two billion, one hundred twenty-nine million, eight hundred seventy-three thousand, nine hundred seventy-eight".