639297 has 12 divisors (see below), whose sum is σ = 930384. Its totient is φ = 423000.

The previous prime is 639269. The next prime is 639299. The reversal of 639297 is 792936.

It is not a de Polignac number, because 639297 - 2⁷ = 639169 is a prime.

639297 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (639299) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 2118 + ... + 2400.

It is an arithmetic number, because the mean of its divisors is an integer number (77532).

2⁶³⁹²⁹⁷ is an apocalyptic number.

It is an amenable number.

639297 is a deficient number, since it is larger than the sum of its proper divisors (291087).

639297 is a wasteful number, since it uses less digits than its factorization.

639297 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 540 (or 537 counting only the distinct ones).

The product of its digits is 20412, while the sum is 36.

The square root of 639297 is about 799.5605042772. The cubic root of 639297 is about 86.1458225496.

It can be divided in two parts, 63929 and 7, that added together give a palindrome (63936).

The spelling of 639297 in words is "six hundred thirty-nine thousand, two hundred ninety-seven".