639463 has 8 divisors (see below), whose sum is σ = 709776. Its totient is φ = 571200.

The previous prime is 639451. The next prime is 639487. The reversal of 639463 is 364936.

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

It is a cyclic number.

It is not a de Polignac number, because 639463 - 2¹³ = 631271 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (639433) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 195 + ... + 1147.

It is an arithmetic number, because the mean of its divisors is an integer number (88722).

2⁶³⁹⁴⁶³ is an apocalyptic number.

639463 is a deficient number, since it is larger than the sum of its proper divisors (70313).

639463 is a wasteful number, since it uses less digits than its factorization.

639463 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1025.

The product of its digits is 11664, while the sum is 31.

The square root of 639463 is about 799.6643045679. The cubic root of 639463 is about 86.1532781188.

The spelling of 639463 in words is "six hundred thirty-nine thousand, four hundred sixty-three".