9639642 has 16 divisors (see below), whose sum is σ = 19471392. Its totient is φ = 3181200.

The previous prime is 9639601. The next prime is 9639649. The reversal of 9639642 is 2469369.

It is a happy number.

9639642 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a self number, because there is not a number n which added to its sum of digits gives 9639642.

It is not an unprimeable number, because it can be changed into a prime (9639649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7348 + ... + 8559.

It is an arithmetic number, because the mean of its divisors is an integer number (1216962).

Almost surely, 2^9639642 is an apocalyptic number.

9639642 is an abundant number, since it is smaller than the sum of its proper divisors (9831750).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

9639642 is a wasteful number, since it uses less digits than its factorization.

9639642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16013.

The product of its digits is 69984, while the sum is 39.

The square root of 9639642 is about 3104.7772866987. Note that the first 3 decimals coincide. The cubic root of 9639642 is about 212.8238531358.

It can be divided in two parts, 963964 and 2, that added together give a triangular number (963966 = T₁₃₈₈).

The spelling of 9639642 in words is "nine million, six hundred thirty-nine thousand, six hundred forty-two".