3856729 has 2 divisors, whose sum is σ = 3856730. Its totient is φ = 3856728.

The previous prime is 3856717. The next prime is 3856733. The reversal of 3856729 is 9276583.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3841600 + 15129 = 1960^2 + 123^2 .

It is an emirp because it is prime and its reverse (9276583) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3856729 - 2¹¹ = 3854681 is a prime.

It is an Ulam number.

It is an alternating number because its digits alternate between odd and even.

It is a junction number, because it is equal to n+sod(n) for n = 3856691 and 3856700.

It is not a weakly prime, because it can be changed into another prime (3856129) 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 as a sum of consecutive naturals, namely, 1928364 + 1928365.

It is an arithmetic number, because the mean of its divisors is an integer number (1928365).

Almost surely, 2^3856729 is an apocalyptic number.

It is an amenable number.

3856729 is a deficient number, since it is larger than the sum of its proper divisors (1).

3856729 is an equidigital number, since it uses as much as digits as its factorization.

3856729 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 90720, while the sum is 40.

The square root of 3856729 is about 1963.8556464262. The cubic root of 3856729 is about 156.8217783725.

The spelling of 3856729 in words is "three million, eight hundred fifty-six thousand, seven hundred twenty-nine".