3993481636 has 27 divisors (see below), whose sum is σ = 7380210411. Its totient is φ = 1890511704.

The previous prime is 3993481633. The next prime is 3993481643. The reversal of 3993481636 is 6361843993.

The square root of 3993481636 is 63194.

It is a perfect power (a square), and thus also a powerful number.

3993481636 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3993481633) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 2400541 + ... + 2402203.

Almost surely, 2^3993481636 is an apocalyptic number.

3993481636 is the 63194-th square number.

It is an amenable number.

3993481636 is a deficient number, since it is larger than the sum of its proper divisors (3386728775).

3993481636 is an equidigital number, since it uses as much as digits as its factorization.

3993481636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3368 (or 1684 counting only the distinct ones).

The product of its digits is 2519424, while the sum is 52.

The cubic root of 3993481636 is about 1586.5383116712.

The spelling of 3993481636 in words is "three billion, nine hundred ninety-three million, four hundred eighty-one thousand, six hundred thirty-six".