5781818 has 8 divisors (see below), whose sum is σ = 9911712. Its totient is φ = 2477916.

The previous prime is 5781803. The next prime is 5781827. The reversal of 5781818 is 8181875.

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

It is an Ulam number.

5781818 is a modest number, since divided by 1818 gives 578 as remainder.

It is a nialpdrome in base 14.

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, 206480 + ... + 206507.

It is an arithmetic number, because the mean of its divisors is an integer number (1238964).

Almost surely, 2^5781818 is an apocalyptic number.

5781818 is a deficient number, since it is larger than the sum of its proper divisors (4129894).

5781818 is a wasteful number, since it uses less digits than its factorization.

5781818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 412996.

The product of its digits is 17920, while the sum is 38.

The square root of 5781818 is about 2404.5411204635. The cubic root of 5781818 is about 179.4822363791.

The spelling of 5781818 in words is "five million, seven hundred eighty-one thousand, eight hundred eighteen".