990117 has 8 divisors (see below), whose sum is σ = 1466880. Its totient is φ = 660060.

The previous prime is 990053. The next prime is 990137. The reversal of 990117 is 711099.

It is not a de Polignac number, because 990117 - 2⁶ = 990053 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27), and also a Moran number because the ratio is a prime number: 36671 = 990117 / (9 + 9 + 0 + 1 + 1 + 7).

It is a plaindrome in base 13.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 990117.

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, 18309 + ... + 18362.

It is an arithmetic number, because the mean of its divisors is an integer number (183360).

2⁹⁹⁰¹¹⁷ is an apocalyptic number.

It is an amenable number.

990117 is a deficient number, since it is larger than the sum of its proper divisors (476763).

990117 is a wasteful number, since it uses less digits than its factorization.

990117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36680 (or 36674 counting only the distinct ones).

The product of its (nonzero) digits is 567, while the sum is 27.

The square root of 990117 is about 995.0462300818. The cubic root of 990117 is about 99.6694754052.

The spelling of 990117 in words is "nine hundred ninety thousand, one hundred seventeen".