660369 has 4 divisors (see below), whose sum is σ = 880496. Its totient is φ = 440244.

The previous prime is 660367. The next prime is 660377. The reversal of 660369 is 963066.

660369 is digitally balanced in base 7, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 660369 - 2¹ = 660367 is a prime.

It is a super-2 number, since 2×660369² = 872174432322, which contains 22 as substring.

It is a D-number.

It is a Duffinian number.

660369 is strictly pandigital in base 7.

660369 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (660367) 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, 110059 + ... + 110064.

It is an arithmetic number, because the mean of its divisors is an integer number (220124).

2⁶⁶⁰³⁶⁹ is an apocalyptic number.

It is an amenable number.

660369 is a deficient number, since it is larger than the sum of its proper divisors (220127).

660369 is a wasteful number, since it uses less digits than its factorization.

660369 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 220126.

The product of its (nonzero) digits is 5832, while the sum is 30.

The square root of 660369 is about 812.6309125304. The cubic root of 660369 is about 87.0820998022.

The spelling of 660369 in words is "six hundred sixty thousand, three hundred sixty-nine".