39399985 has 8 divisors (see below), whose sum is σ = 47526120. Its totient is φ = 31355904.

The previous prime is 39399979. The next prime is 39399991. The reversal of 39399985 is 58999393.

It is an interprime number because it is at equal distance from previous prime (39399979) and next prime (39399991).

It can be written as a sum of positive squares in 4 ways, for example, as 10916416 + 28483569 = 3304^2 + 5337^2 .

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 39399985 - 2¹⁵ = 39367217 is a prime.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 19450 + ... + 21379.

It is an arithmetic number, because the mean of its divisors is an integer number (5940765).

Almost surely, 2^39399985 is an apocalyptic number.

It is an amenable number.

39399985 is a deficient number, since it is larger than the sum of its proper divisors (8126135).

39399985 is a wasteful number, since it uses less digits than its factorization.

39399985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41027.

The product of its digits is 2361960, while the sum is 55.

The square root of 39399985 is about 6276.9407357406. The cubic root of 39399985 is about 340.2765483572.

It can be divided in two parts, 3939 and 9985, that added together give a square (13924 = 118²).

The spelling of 39399985 in words is "thirty-nine million, three hundred ninety-nine thousand, nine hundred eighty-five".