7899994943 has 8 divisors (see below), whose sum is σ = 8269986816. Its totient is φ = 7532212600.

The previous prime is 7899994901. The next prime is 7899994981. The reversal of 7899994943 is 3494999987.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-7899994943 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7899994343) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 545063 + ... + 559368.

It is an arithmetic number, because the mean of its divisors is an integer number (1033748352).

Almost surely, 2^7899994943 is an apocalyptic number.

7899994943 is a deficient number, since it is larger than the sum of its proper divisors (369991873).

7899994943 is a wasteful number, since it uses less digits than its factorization.

7899994943 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1104765.

The product of its digits is 158723712, while the sum is 71.

The square root of 7899994943 is about 88881.9157253038. The cubic root of 7899994943 is about 1991.6312763244.

The spelling of 7899994943 in words is "seven billion, eight hundred ninety-nine million, nine hundred ninety-four thousand, nine hundred forty-three".