39999985 has 8 divisors (see below), whose sum is σ = 48657960. Its totient is φ = 31561344.

The previous prime is 39999983. The next prime is 40000003. The reversal of 39999985 is 58999993.

39999985 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 44944 + 39955041 = 212^2 + 6321^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 39999985 - 2¹ = 39999983 is a prime.

It is not an unprimeable number, because it can be changed into a prime (39999983) 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 in 7 ways as a sum of consecutive naturals, for example, 54430 + ... + 55159.

It is an arithmetic number, because the mean of its divisors is an integer number (6082245).

Almost surely, 2^39999985 is an apocalyptic number.

It is an amenable number.

39999985 is a deficient number, since it is larger than the sum of its proper divisors (8657975).

39999985 is a wasteful number, since it uses less digits than its factorization.

39999985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109667.

The product of its digits is 7085880, while the sum is 61.

The square root of 39999985 is about 6324.5541344825. The cubic root of 39999985 is about 341.9951465859.

The spelling of 39999985 in words is "thirty-nine million, nine hundred ninety-nine thousand, nine hundred eighty-five".