665430 has 32 divisors (see below), whose sum is σ = 1639008. Its totient is φ = 172800.

The previous prime is 665429. The next prime is 665447. The reversal of 665430 is 34566.

665430 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nialpdrome in base 10.

It is a self number, because there is not a number n which added to its sum of digits gives 665430.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 960 + ... + 1500.

It is an arithmetic number, because the mean of its divisors is an integer number (51219).

2⁶⁶⁵⁴³⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 665430, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (819504).

665430 is an abundant number, since it is smaller than the sum of its proper divisors (973578).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

665430 is a wasteful number, since it uses less digits than its factorization.

665430 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 592.

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 665430 is about 815.7389288247. The cubic root of 665430 is about 87.3039966470.

Adding to 665430 its product of nonzero digits (2160), we get a triangular number (667590 = T₁₁₅₅).

Adding to 665430 its reverse (34566), we get a palindrome (699996).

The spelling of 665430 in words is "six hundred sixty-five thousand, four hundred thirty".