1381818 has 8 divisors (see below), whose sum is σ = 2763648. Its totient is φ = 460604.

The previous prime is 1381769. The next prime is 1381819. The reversal of 1381818 is 8181831.

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

1381818 is an admirable number.

1381818 is a modest number, since divided by 1818 gives 138 as remainder.

It is not an unprimeable number, because it can be changed into a prime (1381819) by changing a digit.

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, 115146 + ... + 115157.

It is an arithmetic number, because the mean of its divisors is an integer number (345456).

2^1381818 is an apocalyptic number.

1381818 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

1381818 is a wasteful number, since it uses less digits than its factorization.

1381818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 230308.

The product of its digits is 1536, while the sum is 30.

The square root of 1381818 is about 1175.5075499545. The cubic root of 1381818 is about 111.3824966833.

The spelling of 1381818 in words is "one million, three hundred eighty-one thousand, eight hundred eighteen".