990134920 has 64 divisors (see below), whose sum is σ = 2277979200. Its totient is φ = 387214080.

The previous prime is 990134917. The next prime is 990134939. The reversal of 990134920 is 29431099.

It is a self number, because there is not a number n which added to its sum of digits gives 990134920.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 435627 + ... + 437893.

It is an arithmetic number, because the mean of its divisors is an integer number (35593425).

Almost surely, 2^990134920 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 990134920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1138989600).

990134920 is an abundant number, since it is smaller than the sum of its proper divisors (1287844280).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

990134920 is a wasteful number, since it uses less digits than its factorization.

990134920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2518 (or 2514 counting only the distinct ones).

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 990134920 is about 31466.4093916036. The cubic root of 990134920 is about 996.7007670325.

The spelling of 990134920 in words is "nine hundred ninety million, one hundred thirty-four thousand, nine hundred twenty".