660394 has 16 divisors (see below), whose sum is σ = 1159488. Its totient is φ = 276192.

The previous prime is 660391. The next prime is 660403. The reversal of 660394 is 493066.

It is a super-2 number, since 2×660394² = 872240470472, which contains 22 as substring.

It is a d-powerful number, because it can be written as 6³ + 6⁷ + 3¹⁰ + 0 + 9⁵ + 4⁹ .

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 in 7 ways as a sum of consecutive naturals, for example, 54 + ... + 1150.

It is an arithmetic number, because the mean of its divisors is an integer number (72468).

2⁶⁶⁰³⁹⁴ is an apocalyptic number.

660394 is a deficient number, since it is larger than the sum of its proper divisors (499094).

660394 is a wasteful number, since it uses less digits than its factorization.

660394 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1149.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 660394 is about 812.6462945218. The cubic root of 660394 is about 87.0831986954.

The spelling of 660394 in words is "six hundred sixty thousand, three hundred ninety-four".