978197973 has 4 divisors (see below), whose sum is σ = 1304263968. Its totient is φ = 652131980.

The previous prime is 978197951. The next prime is 978197999. The reversal of 978197973 is 379791879.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 379791879 = 3 ⋅126597293.

It is a cyclic number.

It is not a de Polignac number, because 978197973 - 2⁹ = 978197461 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978197573) 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 3 ways as a sum of consecutive naturals, for example, 163032993 + ... + 163032998.

It is an arithmetic number, because the mean of its divisors is an integer number (326065992).

Almost surely, 2^978197973 is an apocalyptic number.

It is an amenable number.

978197973 is a deficient number, since it is larger than the sum of its proper divisors (326065995).

978197973 is a wasteful number, since it uses less digits than its factorization.

978197973 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 326065994.

The product of its digits is 6001128, while the sum is 60.

The square root of 978197973 is about 31276.1566212986. The cubic root of 978197973 is about 992.6791942541.

The spelling of 978197973 in words is "nine hundred seventy-eight million, one hundred ninety-seven thousand, nine hundred seventy-three".