39856081 has 2 divisors, whose sum is σ = 39856082. Its totient is φ = 39856080.

The previous prime is 39856057. The next prime is 39856097. The reversal of 39856081 is 18065893.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26780625 + 13075456 = 5175^2 + 3616^2 .

It is a cyclic number.

It is not a de Polignac number, because 39856081 - 2¹³ = 39847889 is a prime.

It is a super-2 number, since 2×39856081² = 3177014385357122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (39856051) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19928040 + 19928041.

It is an arithmetic number, because the mean of its divisors is an integer number (19928041).

Almost surely, 2^39856081 is an apocalyptic number.

It is an amenable number.

39856081 is a deficient number, since it is larger than the sum of its proper divisors (1).

39856081 is an equidigital number, since it uses as much as digits as its factorization.

39856081 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 39856081 is about 6313.1672716632. The cubic root of 39856081 is about 341.5845330500.

The spelling of 39856081 in words is "thirty-nine million, eight hundred fifty-six thousand, eighty-one".