990197 has 8 divisors (see below), whose sum is σ = 1085280. Its totient is φ = 897840.

The previous prime is 990181. The next prime is 990211. The reversal of 990197 is 791099.

It is a happy number.

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 990197 - 2⁴ = 990181 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 (990137) 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, 122 + ... + 1412.

It is an arithmetic number, because the mean of its divisors is an integer number (135660).

2⁹⁹⁰¹⁹⁷ is an apocalyptic number.

It is an amenable number.

990197 is a deficient number, since it is larger than the sum of its proper divisors (95083).

990197 is a wasteful number, since it uses less digits than its factorization.

990197 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1363.

The product of its (nonzero) digits is 5103, while the sum is 35.

The square root of 990197 is about 995.0864284071. The cubic root of 990197 is about 99.6721597153.

The spelling of 990197 in words is "nine hundred ninety thousand, one hundred ninety-seven".