39666899 has 4 divisors (see below), whose sum is σ = 42000264. Its totient is φ = 37333536.

The previous prime is 39666883. The next prime is 39666911. The reversal of 39666899 is 99866693.

39666899 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 99866693 = 41 ⋅2435773.

It is a cyclic number.

It is not a de Polignac number, because 39666899 - 2⁴ = 39666883 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (39666829) 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 3 ways as a sum of consecutive naturals, for example, 1166657 + ... + 1166690.

It is an arithmetic number, because the mean of its divisors is an integer number (10500066).

Almost surely, 2^39666899 is an apocalyptic number.

39666899 is a deficient number, since it is larger than the sum of its proper divisors (2333365).

39666899 is a wasteful number, since it uses less digits than its factorization.

39666899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2333364.

The product of its digits is 3779136, while the sum is 56.

The square root of 39666899 is about 6298.1663204460. The cubic root of 39666899 is about 341.0432174050.

The spelling of 39666899 in words is "thirty-nine million, six hundred sixty-six thousand, eight hundred ninety-nine".