3720021686 has 8 divisors (see below), whose sum is σ = 5610861984. Its totient is φ = 1849734360.

The previous prime is 3720021677. The next prime is 3720021689. The reversal of 3720021686 is 6861200273.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×3720021686² = 27677122688620565192, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3720021689) 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 3 ways as a sum of consecutive naturals, for example, 5137790 + ... + 5138513.

It is an arithmetic number, because the mean of its divisors is an integer number (701357748).

Almost surely, 2^3720021686 is an apocalyptic number.

3720021686 is a deficient number, since it is larger than the sum of its proper divisors (1890840298).

3720021686 is a wasteful number, since it uses less digits than its factorization.

3720021686 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10276486.

The product of its (nonzero) digits is 24192, while the sum is 35.

The square root of 3720021686 is about 60991.9805056370. The cubic root of 3720021686 is about 1549.4651898927.

The spelling of 3720021686 in words is "three billion, seven hundred twenty million, twenty-one thousand, six hundred eighty-six".