9959643 has 6 divisors (see below), whose sum is σ = 14386164. Its totient is φ = 6639756.

The previous prime is 9959641. The next prime is 9959659. The reversal of 9959643 is 3469599.

It is a happy number.

It is not a de Polignac number, because 9959643 - 2¹ = 9959641 is a prime.

9959643 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (9959641) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 553305 + ... + 553322.

It is an arithmetic number, because the mean of its divisors is an integer number (2397694).

Almost surely, 2^9959643 is an apocalyptic number.

9959643 is a deficient number, since it is larger than the sum of its proper divisors (4426521).

9959643 is a wasteful number, since it uses less digits than its factorization.

9959643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1106633 (or 1106630 counting only the distinct ones).

The product of its digits is 262440, while the sum is 45.

The square root of 9959643 is about 3155.8902072157. The cubic root of 9959643 is about 215.1532565129.

It can be divided in two parts, 995964 and 3, that multiplied together give a palindrome (2987892).

The spelling of 9959643 in words is "nine million, nine hundred fifty-nine thousand, six hundred forty-three".