660842 has 16 divisors (see below), whose sum is σ = 1220352. Its totient is φ = 261360.

The previous prime is 660833. The next prime is 660851. The reversal of 660842 is 248066.

It is an interprime number because it is at equal distance from previous prime (660833) and next prime (660851).

It is a Smith number, since the sum of its digits (26) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Harshad number since it is a multiple of its sum of digits (26).

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1634 + ... + 1997.

It is an arithmetic number, because the mean of its divisors is an integer number (76272).

2⁶⁶⁰⁸⁴² is an apocalyptic number.

660842 is a deficient number, since it is larger than the sum of its proper divisors (559510).

660842 is a wasteful number, since it uses less digits than its factorization.

660842 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3653.

The product of its (nonzero) digits is 2304, while the sum is 26.

The square root of 660842 is about 812.9218904667. The cubic root of 660842 is about 87.1028861619.

The spelling of 660842 in words is "six hundred sixty thousand, eight hundred forty-two".