990769 has 4 divisors (see below), whose sum is σ = 1066996. Its totient is φ = 914544.

The previous prime is 990767. The next prime is 990797. The reversal of 990769 is 967099.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 967099 = 7 ⋅138157.

It can be written as a sum of positive squares in 2 ways, for example, as 374544 + 616225 = 612^2 + 785^2 .

It is a cyclic number.

It is not a de Polignac number, because 990769 - 2¹ = 990767 is a prime.

It is a super-2 number, since 2×990769² = 1963246422722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (990761) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38094 + ... + 38119.

It is an arithmetic number, because the mean of its divisors is an integer number (266749).

2⁹⁹⁰⁷⁶⁹ is an apocalyptic number.

It is an amenable number.

990769 is a deficient number, since it is larger than the sum of its proper divisors (76227).

990769 is a wasteful number, since it uses less digits than its factorization.

990769 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76226.

The product of its (nonzero) digits is 30618, while the sum is 40.

The square root of 990769 is about 995.3737991328. The cubic root of 990769 is about 99.6913483215.

The spelling of 990769 in words is "nine hundred ninety thousand, seven hundred sixty-nine".