3981913 has 4 divisors (see below), whose sum is σ = 4288228. Its totient is φ = 3675600.

The previous prime is 3981911. The next prime is 3981917. The reversal of 3981913 is 3191893.

3981913 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2271049 + 1710864 = 1507^2 + 1308^2 .

It is a cyclic number.

It is not a de Polignac number, because 3981913 - 2¹ = 3981911 is a prime.

It is a super-2 number, since 2×3981913² = 31711262279138, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3981911) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 153138 + ... + 153163.

It is an arithmetic number, because the mean of its divisors is an integer number (1072057).

Almost surely, 2^3981913 is an apocalyptic number.

It is an amenable number.

3981913 is a deficient number, since it is larger than the sum of its proper divisors (306315).

3981913 is a wasteful number, since it uses less digits than its factorization.

3981913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306314.

The product of its digits is 5832, while the sum is 34.

The square root of 3981913 is about 1995.4731268549. The cubic root of 3981913 is about 158.5004826384.

The spelling of 3981913 in words is "three million, nine hundred eighty-one thousand, nine hundred thirteen".