39657985 has 4 divisors (see below), whose sum is σ = 47589588. Its totient is φ = 31726384.

The previous prime is 39657979. The next prime is 39658007. The reversal of 39657985 is 58975693.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14737921 + 24920064 = 3839^2 + 4992^2 .

It is a cyclic number.

It is not a de Polignac number, because 39657985 - 2¹¹ = 39655937 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3965794 + ... + 3965803.

It is an arithmetic number, because the mean of its divisors is an integer number (11897397).

Almost surely, 2^39657985 is an apocalyptic number.

It is an amenable number.

39657985 is a deficient number, since it is larger than the sum of its proper divisors (7931603).

39657985 is an equidigital number, since it uses as much as digits as its factorization.

39657985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7931602.

The product of its digits is 2041200, while the sum is 52.

The square root of 39657985 is about 6297.4586143936. The cubic root of 39657985 is about 341.0176689245.

The spelling of 39657985 in words is "thirty-nine million, six hundred fifty-seven thousand, nine hundred eighty-five".