4381918 has 4 divisors (see below), whose sum is σ = 6572880. Its totient is φ = 2190958.

The previous prime is 4381879. The next prime is 4381921. The reversal of 4381918 is 8191834.

It is a happy number.

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

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 1095478 + ... + 1095481.

It is an arithmetic number, because the mean of its divisors is an integer number (1643220).

Almost surely, 2^4381918 is an apocalyptic number.

4381918 is a deficient number, since it is larger than the sum of its proper divisors (2190962).

4381918 is a wasteful number, since it uses less digits than its factorization.

4381918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2190961.

The product of its digits is 6912, while the sum is 34.

The square root of 4381918 is about 2093.3031314169. The cubic root of 4381918 is about 163.6394767272.

The spelling of 4381918 in words is "four million, three hundred eighty-one thousand, nine hundred eighteen".