990166 has 16 divisors (see below), whose sum is σ = 1589760. Its totient is φ = 461160.

The previous prime is 990163. The next prime is 990169. The reversal of 990166 is 661099.

It is an interprime number because it is at equal distance from previous prime (990163) and next prime (990169).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2515 + ... + 2881.

It is an arithmetic number, because the mean of its divisors is an integer number (99360).

2⁹⁹⁰¹⁶⁶ is an apocalyptic number.

990166 is a deficient number, since it is larger than the sum of its proper divisors (599594).

990166 is a wasteful number, since it uses less digits than its factorization.

990166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459.

The product of its (nonzero) digits is 2916, while the sum is 31.

The square root of 990166 is about 995.0708517488. The cubic root of 990166 is about 99.6711195623.

It can be divided in two parts, 990 and 166, that added together give a square (1156 = 34²).

The spelling of 990166 in words is "nine hundred ninety thousand, one hundred sixty-six".