3999993209855 has 8 divisors (see below), whose sum is σ = 4811128726464. Its totient is φ = 3192569984800.

The previous prime is 3999993209783. The next prime is 3999993209881. The reversal of 3999993209855 is 5589023999993.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 3999993209855 - 2¹⁶ = 3999993144319 is a prime.

It is a super-2 number, since 2×3999993209855² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 3999993209855.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 928070516 + ... + 928074825.

It is an arithmetic number, because the mean of its divisors is an integer number (601391090808).

Almost surely, 2^{3999993209855} is an apocalyptic number.

3999993209855 is a deficient number, since it is larger than the sum of its proper divisors (811135516609).

3999993209855 is a wasteful number, since it uses less digits than its factorization.

3999993209855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1856145777.

The product of its (nonzero) digits is 1913187600, while the sum is 80.

The spelling of 3999993209855 in words is "three trillion, nine hundred ninety-nine billion, nine hundred ninety-three million, two hundred nine thousand, eight hundred fifty-five".