9661939 has 4 divisors (see below), whose sum is σ = 11042224. Its totient is φ = 8281656.

The previous prime is 9661919. The next prime is 9661943. The reversal of 9661939 is 9391669.

9661939 is digitally balanced in base 3, 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.

It is a cyclic number.

It is not a de Polignac number, because 9661939 - 2¹¹ = 9659891 is a prime.

It is an Ulam number.

It is a Duffinian number.

9661939 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 9661895 and 9661904.

It is not an unprimeable number, because it can be changed into a prime (9661919) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 690132 + ... + 690145.

It is an arithmetic number, because the mean of its divisors is an integer number (2760556).

Almost surely, 2^9661939 is an apocalyptic number.

9661939 is a deficient number, since it is larger than the sum of its proper divisors (1380285).

9661939 is a wasteful number, since it uses less digits than its factorization.

9661939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1380284.

The product of its digits is 78732, while the sum is 43.

The square root of 9661939 is about 3108.3659694444. The cubic root of 9661939 is about 212.9878177108.

The spelling of 9661939 in words is "nine million, six hundred sixty-one thousand, nine hundred thirty-nine".