3909818 has 16 divisors (see below), whose sum is σ = 6548256. Its totient is φ = 1735440.

The previous prime is 3909817. The next prime is 3909853. The reversal of 3909818 is 8189093.

It is not an unprimeable number, because it can be changed into a prime (3909817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1121 + ... + 3012.

It is an arithmetic number, because the mean of its divisors is an integer number (409266).

Almost surely, 2^3909818 is an apocalyptic number.

3909818 is a deficient number, since it is larger than the sum of its proper divisors (2638438).

3909818 is a wasteful number, since it uses less digits than its factorization.

3909818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4189.

The product of its (nonzero) digits is 15552, while the sum is 38.

The square root of 3909818 is about 1977.3259721149. The cubic root of 3909818 is about 157.5380675599.

Subtracting 3909818 from its reverse (8189093), we obtain a triangular number (4279275 = T₂₉₂₅).

The spelling of 3909818 in words is "three million, nine hundred nine thousand, eight hundred eighteen".