3659685987 has 18 divisors (see below), whose sum is σ = 4980944332. Its totient is φ = 2390124464.

The previous prime is 3659685961. The next prime is 3659685989. The reversal of 3659685987 is 7895869563.

It is not a de Polignac number, because 3659685987 - 2⁶ = 3659685923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3659685989) 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 17 ways as a sum of consecutive naturals, for example, 5553064 + ... + 5553722.

Almost surely, 2^3659685987 is an apocalyptic number.

3659685987 is a deficient number, since it is larger than the sum of its proper divisors (1321258345).

3659685987 is an frugal number, since it uses more digits than its factorization.

3659685987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1427 (or 715 counting only the distinct ones).

The product of its digits is 97977600, while the sum is 66.

The square root of 3659685987 is about 60495.3385559582. The cubic root of 3659685987 is about 1541.0424699376.

The spelling of 3659685987 in words is "three billion, six hundred fifty-nine million, six hundred eighty-five thousand, nine hundred eighty-seven".