990665385 has 16 divisors (see below), whose sum is σ = 1599880896. Its totient is φ = 523416128.

The previous prime is 990665383. The next prime is 990665387. The reversal of 990665385 is 583566099.

990665385 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (990665383) and next prime (990665387).

It is a cyclic number.

It is not a de Polignac number, because 990665385 - 2¹ = 990665383 is a prime.

It is not an unprimeable number, because it can be changed into a prime (990665383) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 307014 + ... + 310223.

It is an arithmetic number, because the mean of its divisors is an integer number (99992556).

Almost surely, 2^990665385 is an apocalyptic number.

It is an amenable number.

990665385 is a deficient number, since it is larger than the sum of its proper divisors (609215511).

990665385 is a wasteful number, since it uses less digits than its factorization.

990665385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 617352.

The product of its (nonzero) digits is 1749600, while the sum is 51.

The square root of 990665385 is about 31474.8373307949. The cubic root of 990665385 is about 996.8787294731.

The spelling of 990665385 in words is "nine hundred ninety million, six hundred sixty-five thousand, three hundred eighty-five".