999689965 has 4 divisors (see below), whose sum is σ = 1199627964. Its totient is φ = 799751968.

The previous prime is 999689941. The next prime is 999689983. The reversal of 999689965 is 569986999.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 759222916 + 240467049 = 27554^2 + 15507^2 .

It is a cyclic number.

It is not a de Polignac number, because 999689965 - 2¹³ = 999681773 is a prime.

It is a super-2 number, since 2×999689965² = 1998760052243402450, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 999689894 and 999689903.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 99968992 + ... + 99969001.

It is an arithmetic number, because the mean of its divisors is an integer number (299906991).

Almost surely, 2^999689965 is an apocalyptic number.

It is an amenable number.

999689965 is a deficient number, since it is larger than the sum of its proper divisors (199937999).

999689965 is a wasteful number, since it uses less digits than its factorization.

999689965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199937998.

The product of its digits is 85030560, while the sum is 70.

The square root of 999689965 is about 31617.8741378986. The cubic root of 999689965 is about 999.8966443180.

The spelling of 999689965 in words is "nine hundred ninety-nine million, six hundred eighty-nine thousand, nine hundred sixty-five".