638379 has 12 divisors (see below), whose sum is σ = 1053936. Its totient is φ = 364752.

The previous prime is 638371. The next prime is 638423. The reversal of 638379 is 973836.

638379 = 207² + 208² + ... + 220².

It is not a de Polignac number, because 638379 - 2³ = 638371 is a prime.

638379 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (638371) 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 11 ways as a sum of consecutive naturals, for example, 5004 + ... + 5129.

It is an arithmetic number, because the mean of its divisors is an integer number (87828).

2⁶³⁸³⁷⁹ is an apocalyptic number.

638379 is a deficient number, since it is larger than the sum of its proper divisors (415557).

638379 is a wasteful number, since it uses less digits than its factorization.

638379 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10146 (or 10143 counting only the distinct ones).

The product of its digits is 27216, while the sum is 36.

The square root of 638379 is about 798.9862326724. The cubic root of 638379 is about 86.1045690332.

The spelling of 638379 in words is "six hundred thirty-eight thousand, three hundred seventy-nine".