640382 has 8 divisors (see below), whose sum is σ = 966000. Its totient is φ = 318384.

The previous prime is 640369. The next prime is 640411. The reversal of 640382 is 283046.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

640382 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 407 + ... + 1202.

It is an arithmetic number, because the mean of its divisors is an integer number (120750).

2⁶⁴⁰³⁸² is an apocalyptic number.

640382 is a deficient number, since it is larger than the sum of its proper divisors (325618).

640382 is a wasteful number, since it uses less digits than its factorization.

640382 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1810.

The product of its (nonzero) digits is 1152, while the sum is 23.

The square root of 640382 is about 800.2387143847. The cubic root of 640382 is about 86.1945299005.

The spelling of 640382 in words is "six hundred forty thousand, three hundred eighty-two".