9999765 has 24 divisors (see below), whose sum is σ = 17412408. Its totient is φ = 5308800.

The previous prime is 9999761. The next prime is 9999823. The reversal of 9999765 is 5679999.

It can be written as a sum of positive squares in 4 ways, for example, as 617796 + 9381969 = 786^2 + 3063^2 .

It is not a de Polignac number, because 9999765 - 2² = 9999761 is a prime.

It is an Ulam number.

It is a nialpdrome in base 10.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9999761) 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 23 ways as a sum of consecutive naturals, for example, 13915 + ... + 14615.

It is an arithmetic number, because the mean of its divisors is an integer number (725517).

Almost surely, 2^9999765 is an apocalyptic number.

It is an amenable number.

9999765 is a deficient number, since it is larger than the sum of its proper divisors (7412643).

9999765 is a wasteful number, since it uses less digits than its factorization.

9999765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1029 (or 1026 counting only the distinct ones).

The product of its digits is 1377810, while the sum is 54.

The square root of 9999765 is about 3162.2405031876. The cubic root of 9999765 is about 215.4417813495.

The spelling of 9999765 in words is "nine million, nine hundred ninety-nine thousand, seven hundred sixty-five".