3913581 has 24 divisors (see below), whose sum is σ = 6165120. Its totient is φ = 2201472.

The previous prime is 3913561. The next prime is 3913583. The reversal of 3913581 is 1853193.

It is a happy number.

It is not a de Polignac number, because 3913581 - 2¹⁷ = 3782509 is a prime.

It is a super-2 number, since 2×3913581² = 30632232487122, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3913583) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11445 + ... + 11781.

It is an arithmetic number, because the mean of its divisors is an integer number (256880).

Almost surely, 2^3913581 is an apocalyptic number.

It is an amenable number.

3913581 is a deficient number, since it is larger than the sum of its proper divisors (2251539).

3913581 is a wasteful number, since it uses less digits than its factorization.

3913581 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433 (or 426 counting only the distinct ones).

The product of its digits is 3240, while the sum is 30.

The square root of 3913581 is about 1978.2772808684. The cubic root of 3913581 is about 157.5885921338.

The spelling of 3913581 in words is "three million, nine hundred thirteen thousand, five hundred eighty-one".