3646921986 has 24 divisors (see below), whose sum is σ = 7903628460. Its totient is φ = 1215338496.

The previous prime is 3646921979. The next prime is 3646921987. The reversal of 3646921986 is 6891296463.

3646921986 is a `hidden beast` number, since 364 + 6 + 92 + 198 + 6 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 3188747961 + 458174025 = 56469^2 + 21405^2 .

It is not an unprimeable number, because it can be changed into a prime (3646921987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 56386 + ... + 102338.

Almost surely, 2^3646921986 is an apocalyptic number.

3646921986 is an abundant number, since it is smaller than the sum of its proper divisors (4256706474).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3646921986 is a wasteful number, since it uses less digits than its factorization.

3646921986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50370 (or 50367 counting only the distinct ones).

The product of its digits is 3359232, while the sum is 54.

The square root of 3646921986 is about 60389.7506701261. The cubic root of 3646921986 is about 1539.2488024074.

The spelling of 3646921986 in words is "three billion, six hundred forty-six million, nine hundred twenty-one thousand, nine hundred eighty-six".