990449593 has 6 divisors (see below), whose sum is σ = 1152155706. Its totient is φ = 848956752.

The previous prime is 990449561. The next prime is 990449599. The reversal of 990449593 is 395944099.

It can be written as a sum of positive squares in only one way, i.e., 905588649 + 84860944 = 30093^2 + 9212^2 .

It is not a de Polignac number, because 990449593 - 2⁵ = 990449561 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 990449593.

It is not an unprimeable number, because it can be changed into a prime (990449599) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10106580 + ... + 10106677.

It is an arithmetic number, because the mean of its divisors is an integer number (192025951).

Almost surely, 2^990449593 is an apocalyptic number.

It is an amenable number.

990449593 is a deficient number, since it is larger than the sum of its proper divisors (161706113).

990449593 is a wasteful number, since it uses less digits than its factorization.

990449593 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20213271 (or 20213264 counting only the distinct ones).

The product of its (nonzero) digits is 1574640, while the sum is 52.

The square root of 990449593 is about 31471.4091359126. The cubic root of 990449593 is about 996.8063424090.

The spelling of 990449593 in words is "nine hundred ninety million, four hundred forty-nine thousand, five hundred ninety-three".