1978018195 has 16 divisors (see below), whose sum is σ = 2409039360. Its totient is φ = 1558893024.

The previous prime is 1978018183. The next prime is 1978018213. The reversal of 1978018195 is 5918108791.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 1978018195 - 2⁹ = 1978017683 is a prime.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 179104 + ... + 189826.

It is an arithmetic number, because the mean of its divisors is an integer number (150564960).

Almost surely, 2^1978018195 is an apocalyptic number.

1978018195 is a deficient number, since it is larger than the sum of its proper divisors (431021165).

1978018195 is a wasteful number, since it uses less digits than its factorization.

1978018195 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11274.

The product of its (nonzero) digits is 181440, while the sum is 49.

The square root of 1978018195 is about 44474.9164698485. The cubic root of 1978018195 is about 1255.2881451357.

The spelling of 1978018195 in words is "one billion, nine hundred seventy-eight million, eighteen thousand, one hundred ninety-five".