39961646 has 4 divisors (see below), whose sum is σ = 59942472. Its totient is φ = 19980822.

The previous prime is 39961639. The next prime is 39961661. The reversal of 39961646 is 64616993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 64616993 = 7 ⋅9230999.

It is a junction number, because it is equal to n+sod(n) for n = 39961597 and 39961606.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9990410 + ... + 9990413.

It is an arithmetic number, because the mean of its divisors is an integer number (14985618).

Almost surely, 2^39961646 is an apocalyptic number.

39961646 is a deficient number, since it is larger than the sum of its proper divisors (19980826).

39961646 is a wasteful number, since it uses less digits than its factorization.

39961646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19980825.

The product of its digits is 209952, while the sum is 44.

The square root of 39961646 is about 6321.5224432094. The cubic root of 39961646 is about 341.8858470178.

The spelling of 39961646 in words is "thirty-nine million, nine hundred sixty-one thousand, six hundred forty-six".