39861966 has 16 divisors (see below), whose sum is σ = 79794000. Its totient is φ = 13275648.

The previous prime is 39861961. The next prime is 39861977. The reversal of 39861966 is 66916893.

39861966 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39861961) 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 7 ways as a sum of consecutive naturals, for example, 7150 + ... + 11438.

It is an arithmetic number, because the mean of its divisors is an integer number (4987125).

Almost surely, 2^39861966 is an apocalyptic number.

39861966 is an abundant number, since it is smaller than the sum of its proper divisors (39932034).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

39861966 is a wasteful number, since it uses less digits than its factorization.

39861966 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5843.

The product of its digits is 419904, while the sum is 48.

The square root of 39861966 is about 6313.6333438045. The cubic root of 39861966 is about 341.6013445879.

The spelling of 39861966 in words is "thirty-nine million, eight hundred sixty-one thousand, nine hundred sixty-six".