990129287 has 16 divisors (see below), whose sum is σ = 1170004800. Its totient is φ = 820171008.

The previous prime is 990129269. The next prime is 990129299. The reversal of 990129287 is 782921099.

It is a happy number.

It is a de Polignac number, because none of the positive numbers 2^k-990129287 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990129227) 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 15 ways as a sum of consecutive naturals, for example, 25763 + ... + 51419.

It is an arithmetic number, because the mean of its divisors is an integer number (73125300).

Almost surely, 2^990129287 is an apocalyptic number.

990129287 is a deficient number, since it is larger than the sum of its proper divisors (179875513).

990129287 is a wasteful number, since it uses less digits than its factorization.

990129287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25850.

The product of its (nonzero) digits is 163296, while the sum is 47.

The square root of 990129287 is about 31466.3198833292. The cubic root of 990129287 is about 996.6988769109.

The spelling of 990129287 in words is "nine hundred ninety million, one hundred twenty-nine thousand, two hundred eighty-seven".