908639 has 4 divisors (see below), whose sum is σ = 911856. Its totient is φ = 905424.

The previous prime is 908627. The next prime is 908653. The reversal of 908639 is 936809.

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 908639 - 2⁴ = 908623 is a prime.

It is a Duffinian number.

It is a plaindrome in base 12.

It is a junction number, because it is equal to n+sod(n) for n = 908599 and 908608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (908669) 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, 1139 + ... + 1764.

It is an arithmetic number, because the mean of its divisors is an integer number (227964).

2⁹⁰⁸⁶³⁹ is an apocalyptic number.

908639 is a deficient number, since it is larger than the sum of its proper divisors (3217).

908639 is a wasteful number, since it uses less digits than its factorization.

908639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3216.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 908639 is about 953.2255766606. The cubic root of 908639 is about 96.8568761100.

The spelling of 908639 in words is "nine hundred eight thousand, six hundred thirty-nine".