1218340 has 12 divisors (see below), whose sum is σ = 2558556. Its totient is φ = 487328.

The previous prime is 1218313. The next prime is 1218367. The reversal of 1218340 is 438121.

1218340 = T₃₃₉ + T₃₄₀ + ... + T₃₅₈.

It is an interprime number because it is at equal distance from previous prime (1218313) and next prime (1218367).

It can be written as a sum of positive squares in 2 ways, for example, as 254016 + 964324 = 504^2 + 982^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30439 + ... + 30478.

It is an arithmetic number, because the mean of its divisors is an integer number (213213).

2^1218340 is an apocalyptic number.

1218340 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1218340 is an abundant number, since it is smaller than the sum of its proper divisors (1340216).

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

1218340 is a wasteful number, since it uses less digits than its factorization.

1218340 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60926 (or 60924 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 19.

The square root of 1218340 is about 1103.7843992375. The cubic root of 1218340 is about 106.8044876473.

The spelling of 1218340 in words is "one million, two hundred eighteen thousand, three hundred forty".