1218090 has 32 divisors (see below), whose sum is σ = 3078720. Its totient is φ = 307584.

The previous prime is 1218089. The next prime is 1218121. The reversal of 1218090 is 908121.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 499 + ... + 1638.

It is an arithmetic number, because the mean of its divisors is an integer number (96210).

2^1218090 is an apocalyptic number.

1218090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

1218090 is an abundant number, since it is smaller than the sum of its proper divisors (1860630).

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

1218090 is a wasteful number, since it uses less digits than its factorization.

1218090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2166.

The product of its (nonzero) digits is 144, while the sum is 21.

The square root of 1218090 is about 1103.6711466737. The cubic root of 1218090 is about 106.7971818191.

The spelling of 1218090 in words is "one million, two hundred eighteen thousand, ninety".