639065 has 24 divisors (see below), whose sum is σ = 953280. Its totient is φ = 401760.

The previous prime is 639053. The next prime is 639083. The reversal of 639065 is 560936.

It is not a de Polignac number, because 639065 - 2⁴ = 639049 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 20600 + ... + 20630.

It is an arithmetic number, because the mean of its divisors is an integer number (39720).

2⁶³⁹⁰⁶⁵ is an apocalyptic number.

It is an amenable number.

639065 is a deficient number, since it is larger than the sum of its proper divisors (314215).

639065 is a wasteful number, since it uses less digits than its factorization.

639065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 93 (or 62 counting only the distinct ones).

The product of its (nonzero) digits is 4860, while the sum is 29.

The square root of 639065 is about 799.4154114101. The cubic root of 639065 is about 86.1354005554.

The spelling of 639065 in words is "six hundred thirty-nine thousand, sixty-five".