638319 has 24 divisors (see below), whose sum is σ = 1003392. Its totient is φ = 357280.

The previous prime is 638317. The next prime is 638327. The reversal of 638319 is 913836.

It is not a de Polignac number, because 638319 - 2¹ = 638317 is a prime.

It is a super-2 number, since 2×638319² = 814902291522, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (638317) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21997 + ... + 22025.

It is an arithmetic number, because the mean of its divisors is an integer number (41808).

2⁶³⁸³¹⁹ is an apocalyptic number.

638319 is a gapful number since it is divisible by the number (69) formed by its first and last digit.

638319 is a deficient number, since it is larger than the sum of its proper divisors (365073).

638319 is a wasteful number, since it uses less digits than its factorization.

638319 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95 (or 66 counting only the distinct ones).

The product of its digits is 3888, while the sum is 30.

The square root of 638319 is about 798.9486842094. The cubic root of 638319 is about 86.1018713484.

The spelling of 638319 in words is "six hundred thirty-eight thousand, three hundred nineteen".