660418 has 12 divisors (see below), whose sum is σ = 1089270. Its totient is φ = 300080.

The previous prime is 660409. The next prime is 660449. The reversal of 660418 is 814066.

It can be written as a sum of positive squares in only one way, i.e., 393129 + 267289 = 627^2 + 517^2 .

It is a junction number, because it is equal to n+sod(n) for n = 660392 and 660401.

It is an unprimeable number.

660418 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1123 + ... + 1606.

2⁶⁶⁰⁴¹⁸ is an apocalyptic number.

660418 is a deficient number, since it is larger than the sum of its proper divisors (428852).

660418 is a wasteful number, since it uses less digits than its factorization.

660418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2753 (or 2742 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 660418 is about 812.6610609596. The cubic root of 660418 is about 87.0842536068.

It can be divided in two parts, 66041 and 8, that added together give a square (66049 = 257²).

The spelling of 660418 in words is "six hundred sixty thousand, four hundred eighteen".