660392 has 8 divisors (see below), whose sum is σ = 1238250. Its totient is φ = 330192.

The previous prime is 660391. The next prime is 660403. The reversal of 660392 is 293066.

It can be written as a sum of positive squares in only one way, i.e., 454276 + 206116 = 674^2 + 454^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×660392² = 872235187328, which contains 22 as substring.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 660392.

It is not an unprimeable number, because it can be changed into a prime (660391) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41267 + ... + 41282.

2⁶⁶⁰³⁹² is an apocalyptic number.

It is an amenable number.

660392 is a deficient number, since it is larger than the sum of its proper divisors (577858).

660392 is a wasteful number, since it uses less digits than its factorization.

660392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82555 (or 82551 counting only the distinct ones).

The product of its (nonzero) digits is 1944, while the sum is 26.

The square root of 660392 is about 812.6450639732. The cubic root of 660392 is about 87.0831107849.

The spelling of 660392 in words is "six hundred sixty thousand, three hundred ninety-two".