3999636 has 36 divisors (see below), whose sum is σ = 10174164. Its totient is φ = 1324800.

The previous prime is 3999629. The next prime is 3999637. The reversal of 3999636 is 6369993.

3999636 is a `hidden beast` number, since 3 + 9 + 9 + 9 + 636 = 666.

3999636 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 2160900 + 1838736 = 1470^2 + 1356^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 3999591 and 3999600.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3999637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8446 + ... + 8906.

Almost surely, 2^3999636 is an apocalyptic number.

3999636 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

3999636 is an abundant number, since it is smaller than the sum of its proper divisors (6174528).

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

3999636 is a wasteful number, since it uses less digits than its factorization.

3999636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 712 (or 707 counting only the distinct ones).

The product of its digits is 236196, while the sum is 45.

The square root of 3999636 is about 1999.9089979297. The cubic root of 3999636 is about 158.7352899342.

The spelling of 3999636 in words is "three million, nine hundred ninety-nine thousand, six hundred thirty-six".