638967 has 8 divisors (see below), whose sum is σ = 973696. Its totient is φ = 365112.

The previous prime is 638959. The next prime is 638971. The reversal of 638967 is 769836.

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

It is not a de Polignac number, because 638967 - 2³ = 638959 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 (638977) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15193 + ... + 15234.

It is an arithmetic number, because the mean of its divisors is an integer number (121712).

2⁶³⁸⁹⁶⁷ is an apocalyptic number.

638967 is a deficient number, since it is larger than the sum of its proper divisors (334729).

638967 is a wasteful number, since it uses less digits than its factorization.

638967 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30437.

The product of its digits is 54432, while the sum is 39.

The square root of 638967 is about 799.3541142698. The cubic root of 638967 is about 86.1309974035.

It can be divided in two parts, 63896 and 7, that added together give a triangular number (63903 = T₃₅₇).

The spelling of 638967 in words is "six hundred thirty-eight thousand, nine hundred sixty-seven".