999129 has 8 divisors (see below), whose sum is σ = 1364832. Its totient is φ = 649760.

The previous prime is 999101. The next prime is 999133. The reversal of 999129 is 921999.

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 999129 - 2⁹ = 998617 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 999129.

It is not an unprimeable number, because it can be changed into a prime (999149) 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, 3939 + ... + 4184.

It is an arithmetic number, because the mean of its divisors is an integer number (170604).

2⁹⁹⁹¹²⁹ is an apocalyptic number.

It is an amenable number.

999129 is a deficient number, since it is larger than the sum of its proper divisors (365703).

999129 is a wasteful number, since it uses less digits than its factorization.

999129 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8167.

The product of its digits is 13122, while the sum is 39.

The square root of 999129 is about 999.5644051286. The cubic root of 999129 is about 99.9709582332.

It can be divided in two parts, 999 and 129, that added together give a triangular number (1128 = T₄₇).

The spelling of 999129 in words is "nine hundred ninety-nine thousand, one hundred twenty-nine".