3918393 has 12 divisors (see below), whose sum is σ = 5855460. Its totient is φ = 2522016.

The previous prime is 3918391. The next prime is 3918401. The reversal of 3918393 is 3938193.

It can be written as a sum of positive squares in 2 ways, for example, as 2471184 + 1447209 = 1572^2 + 1203^2 .

It is not a de Polignac number, because 3918393 - 2¹ = 3918391 is a prime.

It is a super-3 number, since 3×3918393³ (a number of 21 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (3918391) 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 11 ways as a sum of consecutive naturals, for example, 7246 + ... + 7767.

It is an arithmetic number, because the mean of its divisors is an integer number (487955).

Almost surely, 2^3918393 is an apocalyptic number.

It is an amenable number.

3918393 is a deficient number, since it is larger than the sum of its proper divisors (1937067).

3918393 is a wasteful number, since it uses less digits than its factorization.

3918393 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15048 (or 15045 counting only the distinct ones).

The product of its digits is 17496, while the sum is 36.

The square root of 3918393 is about 1979.4931169368. The cubic root of 3918393 is about 157.6531541226.

The spelling of 3918393 in words is "three million, nine hundred eighteen thousand, three hundred ninety-three".