7881394135 has 8 divisors (see below), whose sum is σ = 9460299456. Its totient is φ = 6303364320.

The previous prime is 7881394133. The next prime is 7881394229. The reversal of 7881394135 is 5314931887.

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 7881394135 - 2¹ = 7881394133 is a prime.

It is a super-2 number, since 2×7881394135² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7881394133) 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 7 ways as a sum of consecutive naturals, for example, 198904 + ... + 235213.

It is an arithmetic number, because the mean of its divisors is an integer number (1182537432).

Almost surely, 2^7881394135 is an apocalyptic number.

7881394135 is a deficient number, since it is larger than the sum of its proper divisors (1578905321).

7881394135 is a wasteful number, since it uses less digits than its factorization.

7881394135 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437753.

The product of its digits is 725760, while the sum is 49.

The square root of 7881394135 is about 88777.2163057617. The cubic root of 7881394135 is about 1990.0669266146.

The spelling of 7881394135 in words is "seven billion, eight hundred eighty-one million, three hundred ninety-four thousand, one hundred thirty-five".