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9999965 = 51999993

9999965 has 4 divisors (see below), whose sum is σ = 11999964. Its totient is φ = 7999968.

The previous prime is 9999943. The next prime is 9999971. The reversal of 9999965 is 5699999.

9999965 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5699999 = 26321673.

It can be written as a sum of positive squares in 2 ways, for example, as 1968409 + 8031556 = 1403^2 + 2834^2 .

It is a cyclic number.

It is not a de Polignac number, because 9999965 - 26 = 9999901 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 9999965.

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, 999992 + ... + 1000001.

It is an arithmetic number, because the mean of its divisors is an integer number (2999991).

Almost surely, 29999965 is an apocalyptic number.

It is an amenable number.

9999965 is a deficient number, since it is larger than the sum of its proper divisors (1999999).

9999965 is a wasteful number, since it uses less digits than its factorization.

9999965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1999998.

The product of its digits is 1771470, while the sum is 56.

The square root of 9999965 is about 3162.2721261776. The cubic root of 9999965 is about 215.4432176522.

It can be divided in two parts, 999996 and 5, that added together give a palindrome (1000001).

The spelling of 9999965 in words is "nine million, nine hundred ninety-nine thousand, nine hundred sixty-five".

Divisors: 1 5 1999993 9999965