9899639 has 8 divisors (see below), whose sum is σ = 10063872. Its totient is φ = 9736920.

The previous prime is 9899621. The next prime is 9899641. The reversal of 9899639 is 9369989.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-9899639 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 (9899689) 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, 22754 + ... + 23184.

It is an arithmetic number, because the mean of its divisors is an integer number (1257984).

Almost surely, 2^9899639 is an apocalyptic number.

9899639 is a deficient number, since it is larger than the sum of its proper divisors (164233).

9899639 is a wasteful number, since it uses less digits than its factorization.

9899639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 757.

The product of its digits is 944784, while the sum is 53.

The square root of 9899639 is about 3146.3691773217. The cubic root of 9899639 is about 214.7203069384.

The spelling of 9899639 in words is "nine million, eight hundred ninety-nine thousand, six hundred thirty-nine".