990839305 has 8 divisors (see below), whose sum is σ = 1258948872. Its totient is φ = 746043648.

The previous prime is 990839299. The next prime is 990839387. The reversal of 990839305 is 503938099.

It can be written as a sum of positive squares in 4 ways, for example, as 507015289 + 483824016 = 22517^2 + 21996^2 .

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 990839305 - 2⁵ = 990839273 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5828382 + ... + 5828551.

It is an arithmetic number, because the mean of its divisors is an integer number (157368609).

Almost surely, 2^990839305 is an apocalyptic number.

It is an amenable number.

990839305 is a deficient number, since it is larger than the sum of its proper divisors (268109567).

990839305 is a wasteful number, since it uses less digits than its factorization.

990839305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11656955.

The product of its (nonzero) digits is 262440, while the sum is 46.

The square root of 990839305 is about 31477.6000514652. The cubic root of 990839305 is about 996.9370629953.

The spelling of 990839305 in words is "nine hundred ninety million, eight hundred thirty-nine thousand, three hundred five".