665402 has 8 divisors (see below), whose sum is σ = 1015200. Its totient is φ = 327004.

The previous prime is 665387. The next prime is 665419. The reversal of 665402 is 204566.

665402 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a congruent number.

It is an unprimeable number.

665402 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, 2702 + ... + 2937.

It is an arithmetic number, because the mean of its divisors is an integer number (126900).

2⁶⁶⁵⁴⁰² is an apocalyptic number.

665402 is a deficient number, since it is larger than the sum of its proper divisors (349798).

665402 is a wasteful number, since it uses less digits than its factorization.

665402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5700.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 665402 is about 815.7217662904. The cubic root of 665402 is about 87.3027721023.

Adding to 665402 its reverse (204566), we get a palindrome (869968).

The spelling of 665402 in words is "six hundred sixty-five thousand, four hundred two".