978000197 has 8 divisors (see below), whose sum is σ = 987467544. Its totient is φ = 968547328.

The previous prime is 978000193. The next prime is 978000209. The reversal of 978000197 is 791000879.

It can be written as a sum of positive squares in 4 ways, for example, as 186759556 + 791240641 = 13666^2 + 28129^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 978000197 - 2² = 978000193 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (978000193) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 172703 + ... + 178275.

It is an arithmetic number, because the mean of its divisors is an integer number (123433443).

Almost surely, 2^978000197 is an apocalyptic number.

It is an amenable number.

978000197 is a deficient number, since it is larger than the sum of its proper divisors (9467347).

978000197 is a wasteful number, since it uses less digits than its factorization.

With its predecessor (978000196) it forms a Ruth-Aaron pair, since the sum of their prime factors is the same (7239).

978000197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7239.

The product of its (nonzero) digits is 31752, while the sum is 41.

The square root of 978000197 is about 31272.9946919063. The cubic root of 978000197 is about 992.6122884543.

The spelling of 978000197 in words is "nine hundred seventy-eight million, one hundred ninety-seven", and thus it is an aban number.