39680991 has 12 divisors (see below), whose sum is σ = 65505232. Its totient is φ = 22674816.

The previous prime is 39680969. The next prime is 39680999. The reversal of 39680991 is 19908693.

It is not a de Polignac number, because 39680991 - 2⁹ = 39680479 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (39680999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 314866 + ... + 314991.

Almost surely, 2^39680991 is an apocalyptic number.

39680991 is a deficient number, since it is larger than the sum of its proper divisors (25824241).

39680991 is a wasteful number, since it uses less digits than its factorization.

39680991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 629870 (or 629867 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 45.

The square root of 39680991 is about 6299.2849594220. The cubic root of 39680991 is about 341.0835987820.

It can be divided in two parts, 396809 and 91, that added together give a square (396900 = 630²).

The spelling of 39680991 in words is "thirty-nine million, six hundred eighty thousand, nine hundred ninety-one".