9869639 has 24 divisors (see below), whose sum is σ = 11759328. Its totient is φ = 8225280.

The previous prime is 9869633. The next prime is 9869641. The reversal of 9869639 is 9369689.

9869639 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-9869639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9869633) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 138974 + ... + 139044.

It is an arithmetic number, because the mean of its divisors is an integer number (489972).

Almost surely, 2^9869639 is an apocalyptic number.

9869639 is a deficient number, since it is larger than the sum of its proper divisors (1889689).

9869639 is a wasteful number, since it uses less digits than its factorization.

9869639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155 (or 138 counting only the distinct ones).

The product of its digits is 629856, while the sum is 50.

The square root of 9869639 is about 3141.5981601726. The cubic root of 9869639 is about 214.5031903648.

Adding to 9869639 its sum of digits (50), we get a palindrome (9869689).

The spelling of 9869639 in words is "nine million, eight hundred sixty-nine thousand, six hundred thirty-nine".