1978698673 has 8 divisors (see below), whose sum is σ = 2268597248. Its totient is φ = 1690606944.

The previous prime is 1978698649. The next prime is 1978698679. The reversal of 1978698673 is 3768968791.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1978698673 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1978698679) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 449361 + ... + 453742.

It is an arithmetic number, because the mean of its divisors is an integer number (283574656).

Almost surely, 2^1978698673 is an apocalyptic number.

It is an amenable number.

1978698673 is a deficient number, since it is larger than the sum of its proper divisors (289898575).

1978698673 is an equidigital number, since it uses as much as digits as its factorization.

1978698673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 903423.

The product of its digits is 27433728, while the sum is 64.

The square root of 1978698673 is about 44482.5659444237. The cubic root of 1978698673 is about 1255.4320767459.

The spelling of 1978698673 in words is "one billion, nine hundred seventy-eight million, six hundred ninety-eight thousand, six hundred seventy-three".