3683686849 has 4 divisors (see below), whose sum is σ = 3744075220. Its totient is φ = 3623298480.

The previous prime is 3683686843. The next prime is 3683686933. The reversal of 3683686849 is 9486863863.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 372490000 + 3311196849 = 19300^2 + 57543^2 .

It is a cyclic number.

It is not a de Polignac number, because 3683686849 - 2⁹ = 3683686337 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (61), and also a Moran number because the ratio is a prime number: 60388309 = 3683686849 / (3 + 6 + 8 + 3 + 6 + 8 + 6 + 8 + 4 + 9).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3683686843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 30194094 + ... + 30194215.

It is an arithmetic number, because the mean of its divisors is an integer number (936018805).

Almost surely, 2^3683686849 is an apocalyptic number.

It is an amenable number.

3683686849 is a deficient number, since it is larger than the sum of its proper divisors (60388371).

3683686849 is an equidigital number, since it uses as much as digits as its factorization.

3683686849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60388370.

The product of its digits is 35831808, while the sum is 61.

The square root of 3683686849 is about 60693.3838980823. The cubic root of 3683686849 is about 1544.4039410927.

The spelling of 3683686849 in words is "three billion, six hundred eighty-three million, six hundred eighty-six thousand, eight hundred forty-nine".