3781918 has 32 divisors (see below), whose sum is σ = 6840000. Its totient is φ = 1566432.

The previous prime is 3781909. The next prime is 3781951. The reversal of 3781918 is 8191873.

3781918 is nontrivially palindromic in base 13.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is an Ulam number.

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 in 15 ways as a sum of consecutive naturals, for example, 25308 + ... + 25456.

It is an arithmetic number, because the mean of its divisors is an integer number (213750).

Almost surely, 2^3781918 is an apocalyptic number.

3781918 is a deficient number, since it is larger than the sum of its proper divisors (3058082).

3781918 is a wasteful number, since it uses less digits than its factorization.

3781918 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209 (or 195 counting only the distinct ones).

The product of its digits is 12096, while the sum is 37.

The square root of 3781918 is about 1944.7154033431. The cubic root of 3781918 is about 155.8011657003.

The spelling of 3781918 in words is "three million, seven hundred eighty-one thousand, nine hundred eighteen".