3680991 has 8 divisors (see below), whose sum is σ = 5453360. Its totient is φ = 2453976.

The previous prime is 3680987. The next prime is 3681001. The reversal of 3680991 is 1990863.

It is not a de Polignac number, because 3680991 - 2² = 3680987 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 (3680291) 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, 68140 + ... + 68193.

It is an arithmetic number, because the mean of its divisors is an integer number (681670).

Almost surely, 2^3680991 is an apocalyptic number.

3680991 is a deficient number, since it is larger than the sum of its proper divisors (1772369).

3680991 is a wasteful number, since it uses less digits than its factorization.

3680991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 136342 (or 136336 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 3680991 is about 1918.5908891684. The cubic root of 3680991 is about 154.4027099804.

The spelling of 3680991 in words is "three million, six hundred eighty thousand, nine hundred ninety-one".