638290 has 32 divisors (see below), whose sum is σ = 1244160. Its totient is φ = 235200.

The previous prime is 638269. The next prime is 638303. The reversal of 638290 is 92836.

It is an unprimeable 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 in 15 ways as a sum of consecutive naturals, for example, 8955 + ... + 9025.

It is an arithmetic number, because the mean of its divisors is an integer number (38880).

2⁶³⁸²⁹⁰ is an apocalyptic number.

638290 is a deficient number, since it is larger than the sum of its proper divisors (605870).

638290 is a wasteful number, since it uses less digits than its factorization.

638290 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 138.

The product of its (nonzero) digits is 2592, while the sum is 28.

The square root of 638290 is about 798.9305351531. The cubic root of 638290 is about 86.1005674068.

The spelling of 638290 in words is "six hundred thirty-eight thousand, two hundred ninety".