638607 has 4 divisors (see below), whose sum is σ = 851480. Its totient is φ = 425736.

The previous prime is 638587. The next prime is 638621. The reversal of 638607 is 706836.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 638607 - 2¹² = 634511 is a prime.

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 638607.

It is not an unprimeable number, because it can be changed into a prime (630607) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 106432 + ... + 106437.

It is an arithmetic number, because the mean of its divisors is an integer number (212870).

2⁶³⁸⁶⁰⁷ is an apocalyptic number.

638607 is a deficient number, since it is larger than the sum of its proper divisors (212873).

638607 is a wasteful number, since it uses less digits than its factorization.

638607 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 212872.

The product of its (nonzero) digits is 6048, while the sum is 30.

The square root of 638607 is about 799.1289007413. The cubic root of 638607 is about 86.1148186942.

The spelling of 638607 in words is "six hundred thirty-eight thousand, six hundred seven".