1281818 has 8 divisors (see below), whose sum is σ = 1929312. Its totient is φ = 638716.

The previous prime is 1281809. The next prime is 1281821. The reversal of 1281818 is 8181821.

It is a sphenic number, since it is the product of 3 distinct primes.

1281818 is a modest number, since divided by 1818 gives 128 as remainder.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 230 + ... + 1617.

It is an arithmetic number, because the mean of its divisors is an integer number (241164).

2^1281818 is an apocalyptic number.

1281818 is a deficient number, since it is larger than the sum of its proper divisors (647494).

1281818 is a wasteful number, since it uses less digits than its factorization.

1281818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2196.

The product of its digits is 1024, while the sum is 29.

The square root of 1281818 is about 1132.1740148935. The cubic root of 1281818 is about 108.6280846299.

The spelling of 1281818 in words is "one million, two hundred eighty-one thousand, eight hundred eighteen".