990143 has 18 divisors (see below), whose sum is σ = 1273608. Its totient is φ = 766920.

The previous prime is 990137. The next prime is 990151. The reversal of 990143 is 341099.

It is a happy number.

It is not a de Polignac number, because 990143 - 2⁸ = 989887 is a prime.

It is a plaindrome in base 13.

It is a zygodrome in base 6.

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 polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 5846 + ... + 6012.

It is an arithmetic number, because the mean of its divisors is an integer number (70756).

2⁹⁹⁰¹⁴³ is an apocalyptic number.

990143 is a deficient number, since it is larger than the sum of its proper divisors (283465).

990143 is a wasteful number, since it uses less digits than its factorization.

990143 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203 (or 185 counting only the distinct ones).

The product of its (nonzero) digits is 972, while the sum is 26.

The square root of 990143 is about 995.0592947156. The cubic root of 990143 is about 99.6703478219.

The spelling of 990143 in words is "nine hundred ninety thousand, one hundred forty-three".