4081918 has 4 divisors (see below), whose sum is σ = 6122880. Its totient is φ = 2040958.

The previous prime is 4081897. The next prime is 4081933. The reversal of 4081918 is 8191804.

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

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 a self number, because there is not a number n which added to its sum of digits gives 4081918.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1020478 + ... + 1020481.

It is an arithmetic number, because the mean of its divisors is an integer number (1530720).

Almost surely, 2^4081918 is an apocalyptic number.

4081918 is a deficient number, since it is larger than the sum of its proper divisors (2040962).

4081918 is a wasteful number, since it uses less digits than its factorization.

4081918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2040961.

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

The square root of 4081918 is about 2020.3757076346. The cubic root of 4081918 is about 159.8164300936.

The spelling of 4081918 in words is "four million, eighty-one thousand, nine hundred eighteen".