3929581 has 2 divisors, whose sum is σ = 3929582. Its totient is φ = 3929580.

The previous prime is 3929557. The next prime is 3929593. The reversal of 3929581 is 1859293.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3740356 + 189225 = 1934^2 + 435^2 .

It is a cyclic number.

It is not a de Polignac number, because 3929581 - 2¹⁹ = 3405293 is a prime.

It is a super-2 number, since 2×3929581² = 30883213671122, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 3929581.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3929501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1964790 + 1964791.

It is an arithmetic number, because the mean of its divisors is an integer number (1964791).

Almost surely, 2^3929581 is an apocalyptic number.

It is an amenable number.

3929581 is a deficient number, since it is larger than the sum of its proper divisors (1).

3929581 is an equidigital number, since it uses as much as digits as its factorization.

3929581 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 19440, while the sum is 37.

The square root of 3929581 is about 1982.3170785724. The cubic root of 3929581 is about 157.8030580437.

The spelling of 3929581 in words is "three million, nine hundred twenty-nine thousand, five hundred eighty-one".