639074 has 8 divisors (see below), whose sum is σ = 976860. Its totient is φ = 313456.

The previous prime is 639053. The next prime is 639083. The reversal of 639074 is 470936.

It can be written as a sum of positive squares in 2 ways, for example, as 552049 + 87025 = 743^2 + 295^2 .

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

It is a super-3 number, since 3×639074³ = 783023330279691672, which contains 333 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2909 + ... + 3120.

2⁶³⁹⁰⁷⁴ is an apocalyptic number.

639074 is a deficient number, since it is larger than the sum of its proper divisors (337786).

639074 is a wasteful number, since it uses less digits than its factorization.

639074 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6084.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 639074 is about 799.4210405037. The cubic root of 639074 is about 86.1358049039.

The spelling of 639074 in words is "six hundred thirty-nine thousand, seventy-four".