3993917406243 has 16 divisors (see below), whose sum is σ = 5386370496000. Its totient is φ = 2632207344480.

The previous prime is 3993917406239. The next prime is 3993917406287. The reversal of 3993917406243 is 3426047193993.

It is a happy number.

It is not a de Polignac number, because 3993917406243 - 2² = 3993917406239 is a prime.

It is not an unprimeable number, because it can be changed into a prime (3993917406223) 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 15 ways as a sum of consecutive naturals, for example, 21078523 + ... + 21267156.

It is an arithmetic number, because the mean of its divisors is an integer number (336648156000).

Almost surely, 2^{3993917406243} is an apocalyptic number.

3993917406243 is a deficient number, since it is larger than the sum of its proper divisors (1392453089757).

3993917406243 is a wasteful number, since it uses less digits than its factorization.

3993917406243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42346042.

The product of its (nonzero) digits is 26453952, while the sum is 60.

The spelling of 3993917406243 in words is "three trillion, nine hundred ninety-three billion, nine hundred seventeen million, four hundred six thousand, two hundred forty-three".