990038784 has 144 divisors (see below), whose sum is σ = 3061748480. Its totient is φ = 278138880.

The previous prime is 990038783. The next prime is 990038807. The reversal of 990038784 is 487830099.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (990038783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 326427 + ... + 329445.

Almost surely, 2^990038784 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 990038784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1530874240).

990038784 is an abundant number, since it is smaller than the sum of its proper divisors (2071709696).

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

990038784 is a wasteful number, since it uses less digits than its factorization.

990038784 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3106 (or 3092 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 48.

The square root of 990038784 is about 31464.8817572862. The cubic root of 990038784 is about 996.6685081540.

It can be divided in two parts, 9900 and 38784, that added together give a palindrome (48684).

The spelling of 990038784 in words is "nine hundred ninety million, thirty-eight thousand, seven hundred eighty-four".