639496 has 48 divisors (see below), whose sum is σ = 1449360. Its totient is φ = 262080.

The previous prime is 639493. The next prime is 639511. The reversal of 639496 is 694936.

It is a nialpdrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (639491) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14851 + ... + 14893.

It is an arithmetic number, because the mean of its divisors is an integer number (30195).

2⁶³⁹⁴⁹⁶ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 639496, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (724680).

639496 is an abundant number, since it is smaller than the sum of its proper divisors (809864).

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

639496 is a wasteful number, since it uses less digits than its factorization.

639496 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86 (or 69 counting only the distinct ones).

The product of its digits is 34992, while the sum is 37.

The square root of 639496 is about 799.6849379599. The cubic root of 639496 is about 86.1547600963.

It can be divided in two parts, 63 and 9496, that added together give a palindrome (9559).

The spelling of 639496 in words is "six hundred thirty-nine thousand, four hundred ninety-six".