639460 has 12 divisors (see below), whose sum is σ = 1342908. Its totient is φ = 255776.

The previous prime is 639451. The next prime is 639487. The reversal of 639460 is 64936.

It can be written as a sum of positive squares in 2 ways, for example, as 459684 + 179776 = 678^2 + 424^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15967 + ... + 16006.

It is an arithmetic number, because the mean of its divisors is an integer number (111909).

2⁶³⁹⁴⁶⁰ is an apocalyptic number.

It is an amenable number.

639460 is an abundant number, since it is smaller than the sum of its proper divisors (703448).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

639460 is a wasteful number, since it uses less digits than its factorization.

639460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31982 (or 31980 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 639460 is about 799.6624287785. The cubic root of 639460 is about 86.1531433910.

The spelling of 639460 in words is "six hundred thirty-nine thousand, four hundred sixty".