39985309 has 16 divisors (see below), whose sum is σ = 52109568. Its totient is φ = 29774592.

The previous prime is 39985307. The next prime is 39985327. The reversal of 39985309 is 90358993.

It is a cyclic number.

It is not a de Polignac number, because 39985309 - 2¹ = 39985307 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39985301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11377 + ... + 14470.

It is an arithmetic number, because the mean of its divisors is an integer number (3256848).

Almost surely, 2^39985309 is an apocalyptic number.

It is an amenable number.

39985309 is a deficient number, since it is larger than the sum of its proper divisors (12124259).

39985309 is a wasteful number, since it uses less digits than its factorization.

39985309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25884.

The product of its (nonzero) digits is 262440, while the sum is 46.

The square root of 39985309 is about 6323.3937881489. The cubic root of 39985309 is about 341.9533154475.

The spelling of 39985309 in words is "thirty-nine million, nine hundred eighty-five thousand, three hundred nine".