639089 has 4 divisors (see below), whose sum is σ = 697200. Its totient is φ = 580980.

The previous prime is 639083. The next prime is 639091. The reversal of 639089 is 980936.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-639089 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (639083) 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, 29039 + ... + 29060.

It is an arithmetic number, because the mean of its divisors is an integer number (174300).

2⁶³⁹⁰⁸⁹ is an apocalyptic number.

It is an amenable number.

639089 is a deficient number, since it is larger than the sum of its proper divisors (58111).

639089 is a wasteful number, since it uses less digits than its factorization.

639089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 58110.

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

The square root of 639089 is about 799.4304222382. The cubic root of 639089 is about 86.1364788097.

The spelling of 639089 in words is "six hundred thirty-nine thousand, eighty-nine".