39405965944 has 16 divisors (see below), whose sum is σ = 73969875720. Its totient is φ = 19680665760.

The previous prime is 39405965909. The next prime is 39405965981. The reversal of 39405965944 is 44956950493.

It is a happy number.

It is a super-2 number, since 2×39405965944² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2782147 + ... + 2796274.

Almost surely, 2^39405965944 is an apocalyptic number.

It is an amenable number.

39405965944 is a deficient number, since it is larger than the sum of its proper divisors (34563909776).

39405965944 is a wasteful number, since it uses less digits than its factorization.

39405965944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5579310 (or 5579306 counting only the distinct ones).

The product of its (nonzero) digits is 20995200, while the sum is 58.

The spelling of 39405965944 in words is "thirty-nine billion, four hundred five million, nine hundred sixty-five thousand, nine hundred forty-four".