660407 has 4 divisors (see below), whose sum is σ = 720456. Its totient is φ = 600360.

The previous prime is 660403. The next prime is 660409. The reversal of 660407 is 704066.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 660407 - 2² = 660403 is a prime.

It is a super-2 number, since 2×660407² = 872274811298, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30008 + ... + 30029.

It is an arithmetic number, because the mean of its divisors is an integer number (180114).

2⁶⁶⁰⁴⁰⁷ is an apocalyptic number.

660407 is a deficient number, since it is larger than the sum of its proper divisors (60049).

660407 is a wasteful number, since it uses less digits than its factorization.

660407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60048.

The product of its (nonzero) digits is 1008, while the sum is 23.

The square root of 660407 is about 812.6542930423. The cubic root of 660407 is about 87.0837701089.

The spelling of 660407 in words is "six hundred sixty thousand, four hundred seven".