39966909 has 16 divisors (see below), whose sum is σ = 54726144. Its totient is φ = 25930800.

The previous prime is 39966889. The next prime is 39966917. The reversal of 39966909 is 90966993.

It is not a de Polignac number, because 39966909 - 2¹³ = 39958717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39966209) 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, 63024 + ... + 63654.

It is an arithmetic number, because the mean of its divisors is an integer number (3420384).

Almost surely, 2^39966909 is an apocalyptic number.

It is an amenable number.

39966909 is a deficient number, since it is larger than the sum of its proper divisors (14759235).

39966909 is a wasteful number, since it uses less digits than its factorization.

39966909 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1168.

The product of its (nonzero) digits is 708588, while the sum is 51.

The square root of 39966909 is about 6321.9387058085. The cubic root of 39966909 is about 341.9008552937.

The spelling of 39966909 in words is "thirty-nine million, nine hundred sixty-six thousand, nine hundred nine".