990129 has 8 divisors (see below), whose sum is σ = 1508800. Its totient is φ = 565776.

The previous prime is 990053. The next prime is 990137. The reversal of 990129 is 921099.

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

It is not a de Polignac number, because 990129 - 2⁷ = 990001 is a prime.

It is a Duffinian number.

990129 is a lucky number.

It is a plaindrome in base 13.

It is a zygodrome in base 6.

It is a junction number, because it is equal to n+sod(n) for n = 990096 and 990105.

It is not an unprimeable number, because it can be changed into a prime (990169) 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, 23554 + ... + 23595.

It is an arithmetic number, because the mean of its divisors is an integer number (188600).

2⁹⁹⁰¹²⁹ is an apocalyptic number.

It is an amenable number.

990129 is a deficient number, since it is larger than the sum of its proper divisors (518671).

990129 is a wasteful number, since it uses less digits than its factorization.

990129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47159.

The product of its (nonzero) digits is 1458, while the sum is 30.

The square root of 990129 is about 995.0522599341. The cubic root of 990129 is about 99.6698780609.

Subtracting from 990129 its sum of digits (30), we obtain a palindrome (990099).

The spelling of 990129 in words is "nine hundred ninety thousand, one hundred twenty-nine".