3959581 has 8 divisors (see below), whose sum is σ = 4188800. Its totient is φ = 3732480.

The previous prime is 3959551. The next prime is 3959587. The reversal of 3959581 is 1859593.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a 6-Lehmer number, since φ(3959581) divides (3959581-1)⁶.

It is a cyclic number.

It is not a de Polignac number, because 3959581 - 2¹⁷ = 3828509 is a prime.

It is a super-2 number, since 2×3959581² = 31356563391122, which contains 22 as substring.

It is a Duffinian number.

3959581 is a lucky number.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3959587) 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 7 ways as a sum of consecutive naturals, for example, 4765 + ... + 5533.

It is an arithmetic number, because the mean of its divisors is an integer number (523600).

Almost surely, 2^3959581 is an apocalyptic number.

It is an amenable number.

3959581 is a deficient number, since it is larger than the sum of its proper divisors (229219).

3959581 is a wasteful number, since it uses less digits than its factorization.

3959581 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1059.

The product of its digits is 48600, while the sum is 40.

The square root of 3959581 is about 1989.8695937171. The cubic root of 3959581 is about 158.2036177353.

The spelling of 3959581 in words is "three million, nine hundred fifty-nine thousand, five hundred eighty-one".