39966505 has 16 divisors (see below), whose sum is σ = 49616064. Its totient is φ = 30888000.

The previous prime is 39966503. The next prime is 39966523. The reversal of 39966505 is 50566993.

It is a happy number.

39966505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 39966505 - 2¹ = 39966503 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39966503) 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 15 ways as a sum of consecutive naturals, for example, 16630 + ... + 18880.

It is an arithmetic number, because the mean of its divisors is an integer number (3101004).

Almost surely, 2^39966505 is an apocalyptic number.

It is an amenable number.

39966505 is a deficient number, since it is larger than the sum of its proper divisors (9649559).

39966505 is a wasteful number, since it uses less digits than its factorization.

39966505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2376.

The product of its (nonzero) digits is 218700, while the sum is 43.

The square root of 39966505 is about 6321.9067535040. The cubic root of 39966505 is about 341.8997032706.

It can be divided in two parts, 3996 and 6505, that added together give a palindrome (10501).

The spelling of 39966505 in words is "thirty-nine million, nine hundred sixty-six thousand, five hundred five".