990900389 has 8 divisors (see below), whose sum is σ = 1015730688. Its totient is φ = 966226320.

The previous prime is 990900373. The next prime is 990900419. The reversal of 990900389 is 983009099.

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 990900389 - 2⁴ = 990900373 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (990900689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26162 + ... + 51635.

It is an arithmetic number, because the mean of its divisors is an integer number (126966336).

Almost surely, 2^990900389 is an apocalyptic number.

It is an amenable number.

990900389 is a deficient number, since it is larger than the sum of its proper divisors (24830299).

990900389 is a wasteful number, since it uses less digits than its factorization.

990900389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 78115.

The product of its (nonzero) digits is 157464, while the sum is 47.

The square root of 990900389 is about 31478.5703137865. The cubic root of 990900389 is about 996.9575492140.

The spelling of 990900389 in words is "nine hundred ninety million, nine hundred thousand, three hundred eighty-nine".