638701 has 4 divisors (see below), whose sum is σ = 729952. Its totient is φ = 547452.

The previous prime is 638699. The next prime is 638717. The reversal of 638701 is 107836.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 638701 - 2¹ = 638699 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638201) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 45615 + ... + 45628.

It is an arithmetic number, because the mean of its divisors is an integer number (182488).

2⁶³⁸⁷⁰¹ is an apocalyptic number.

It is an amenable number.

638701 is a deficient number, since it is larger than the sum of its proper divisors (91251).

638701 is an equidigital number, since it uses as much as digits as its factorization.

638701 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 91250.

The product of its (nonzero) digits is 1008, while the sum is 25.

The square root of 638701 is about 799.1877126183. The cubic root of 638701 is about 86.1190437214.

The spelling of 638701 in words is "six hundred thirty-eight thousand, seven hundred one".