9898639 has 4 divisors (see below), whose sum is σ = 10419640. Its totient is φ = 9377640.

The previous prime is 9898633. The next prime is 9898649. The reversal of 9898639 is 9368989.

9898639 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 semiprime because it is the product of two primes.

It is not a de Polignac number, because 9898639 - 2¹¹ = 9896591 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 (9898633) 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, 260472 + ... + 260509.

It is an arithmetic number, because the mean of its divisors is an integer number (2604910).

Almost surely, 2^9898639 is an apocalyptic number.

9898639 is a deficient number, since it is larger than the sum of its proper divisors (521001).

9898639 is a wasteful number, since it uses less digits than its factorization.

9898639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 521000.

The product of its digits is 839808, while the sum is 52.

The square root of 9898639 is about 3146.2102599795. The cubic root of 9898639 is about 214.7130767914.

The spelling of 9898639 in words is "nine million, eight hundred ninety-eight thousand, six hundred thirty-nine".