7889393542 has 4 divisors (see below), whose sum is σ = 11834090316. Its totient is φ = 3944696770.

The previous prime is 7889393531. The next prime is 7889393557. The reversal of 7889393542 is 2453939887.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 1972348384 + ... + 1972348387.

It is an arithmetic number, because the mean of its divisors is an integer number (2958522579).

Almost surely, 2^7889393542 is an apocalyptic number.

7889393542 is a deficient number, since it is larger than the sum of its proper divisors (3944696774).

7889393542 is a wasteful number, since it uses less digits than its factorization.

7889393542 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3944696773.

The product of its digits is 13063680, while the sum is 58.

The square root of 7889393542 is about 88822.2581451294. The cubic root of 7889393542 is about 1990.7399874190.

The spelling of 7889393542 in words is "seven billion, eight hundred eighty-nine million, three hundred ninety-three thousand, five hundred forty-two".