4091818 has 4 divisors (see below), whose sum is σ = 6137730. Its totient is φ = 2045908.

The previous prime is 4091809. The next prime is 4091831. The reversal of 4091818 is 8181904.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 3583449 + 508369 = 1893^2 + 713^2 .

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is an Ulam number.

It is a self number, because there is not a number n which added to its sum of digits gives 4091818.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1022953 + ... + 1022956.

Almost surely, 2^4091818 is an apocalyptic number.

4091818 is a deficient number, since it is larger than the sum of its proper divisors (2045912).

4091818 is a wasteful number, since it uses less digits than its factorization.

4091818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2045911.

The product of its (nonzero) digits is 2304, while the sum is 31.

The square root of 4091818 is about 2022.8242632518. The cubic root of 4091818 is about 159.9455283323.

The spelling of 4091818 in words is "four million, ninety-one thousand, eight hundred eighteen".