1218320 has 40 divisors (see below), whose sum is σ = 2880024. Its totient is φ = 479232.

The previous prime is 1218313. The next prime is 1218367. The reversal of 1218320 is 238121.

It can be written as a sum of positive squares in 4 ways, for example, as 43264 + 1175056 = 208^2 + 1084^2 .

It is a tau number, because it is divible by the number of its divisors (40).

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, 7682 + ... + 7838.

2^1218320 is an apocalyptic number.

1218320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1218320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1440012).

1218320 is an abundant number, since it is smaller than the sum of its proper divisors (1661704).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1218320 is a wasteful number, since it uses less digits than its factorization.

1218320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 267 (or 261 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 17.

The square root of 1218320 is about 1103.7753394600. The cubic root of 1218320 is about 106.8039032178.

The spelling of 1218320 in words is "one million, two hundred eighteen thousand, three hundred twenty".