990577 has 4 divisors (see below), whose sum is σ = 1132096. Its totient is φ = 849060.

The previous prime is 990559. The next prime is 990589. The reversal of 990577 is 775099.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-990577 is a prime.

It is not an unprimeable number, because it can be changed into a prime (990547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 70749 + ... + 70762.

It is an arithmetic number, because the mean of its divisors is an integer number (283024).

2⁹⁹⁰⁵⁷⁷ is an apocalyptic number.

It is an amenable number.

990577 is a deficient number, since it is larger than the sum of its proper divisors (141519).

990577 is a wasteful number, since it uses less digits than its factorization.

990577 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141518.

The product of its (nonzero) digits is 19845, while the sum is 37.

The square root of 990577 is about 995.2773482804. The cubic root of 990577 is about 99.6849082144.

The spelling of 990577 in words is "nine hundred ninety thousand, five hundred seventy-seven".