8909639 has 4 divisors (see below), whose sum is σ = 8927856. Its totient is φ = 8891424.

The previous prime is 8909611. The next prime is 8909647. The reversal of 8909639 is 9369098.

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 8909639 - 2¹² = 8905543 is a prime.

It is a super-2 number, since 2×8909639² = 158763334220642, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 8909639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8909609) 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, 8354 + ... + 9359.

It is an arithmetic number, because the mean of its divisors is an integer number (2231964).

Almost surely, 2^8909639 is an apocalyptic number.

8909639 is a deficient number, since it is larger than the sum of its proper divisors (18217).

8909639 is a wasteful number, since it uses less digits than its factorization.

8909639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18216.

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 8909639 is about 2984.9018409321. The cubic root of 8909639 is about 207.3098970165.

The spelling of 8909639 in words is "eight million, nine hundred nine thousand, six hundred thirty-nine".