665384 has 16 divisors (see below), whose sum is σ = 1288320. Its totient is φ = 321840.

The previous prime is 665381. The next prime is 665387. The reversal of 665384 is 483566.

It is an interprime number because it is at equal distance from previous prime (665381) and next prime (665387).

It is a self number, because there is not a number n which added to its sum of digits gives 665384.

It is not an unprimeable number, because it can be changed into a prime (665381) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1094 + ... + 1589.

It is an arithmetic number, because the mean of its divisors is an integer number (80520).

2⁶⁶⁵³⁸⁴ is an apocalyptic number.

It is an amenable number.

665384 is a deficient number, since it is larger than the sum of its proper divisors (622936).

665384 is a wasteful number, since it uses less digits than its factorization.

665384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2720 (or 2716 counting only the distinct ones).

The product of its digits is 17280, while the sum is 32.

The square root of 665384 is about 815.7107330421. The cubic root of 665384 is about 87.3019848769.

The spelling of 665384 in words is "six hundred sixty-five thousand, three hundred eighty-four".