3539981 has 4 divisors (see below), whose sum is σ = 3626364. Its totient is φ = 3453600.

The previous prime is 3539971. The next prime is 3540041. The reversal of 3539981 is 1899353.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1899353 = 43 ⋅44171.

It can be written as a sum of positive squares in 2 ways, for example, as 477481 + 3062500 = 691^2 + 1750^2 .

It is a cyclic number.

It is not a de Polignac number, because 3539981 - 2⁶ = 3539917 is a prime.

It is a super-2 number, since 2×3539981² = 25062930960722, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3539971) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43130 + ... + 43211.

It is an arithmetic number, because the mean of its divisors is an integer number (906591).

Almost surely, 2^3539981 is an apocalyptic number.

It is an amenable number.

3539981 is a deficient number, since it is larger than the sum of its proper divisors (86383).

3539981 is an equidigital number, since it uses as much as digits as its factorization.

3539981 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 86382.

The product of its digits is 29160, while the sum is 38.

The square root of 3539981 is about 1881.4837230229. The cubic root of 3539981 is about 152.4053842909.

The spelling of 3539981 in words is "three million, five hundred thirty-nine thousand, nine hundred eighty-one".