638516 has 6 divisors (see below), whose sum is σ = 1117410. Its totient is φ = 319256.

The previous prime is 638501. The next prime is 638527. The reversal of 638516 is 615836.

It can be written as a sum of positive squares in only one way, i.e., 633616 + 4900 = 796^2 + 70^2 .

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 638516.

It is an unprimeable number.

638516 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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 as a sum of consecutive naturals, namely, 79811 + ... + 79818.

It is an arithmetic number, because the mean of its divisors is an integer number (186235).

2⁶³⁸⁵¹⁶ is an apocalyptic number.

It is an amenable number.

638516 is a deficient number, since it is larger than the sum of its proper divisors (478894).

638516 is a wasteful number, since it uses less digits than its factorization.

638516 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 159633 (or 159631 counting only the distinct ones).

The product of its digits is 4320, while the sum is 29.

The square root of 638516 is about 799.0719617156. The cubic root of 638516 is about 86.1107281133.

The spelling of 638516 in words is "six hundred thirty-eight thousand, five hundred sixteen".