8394540781 has 8 divisors (see below), whose sum is σ = 9158522400. Its totient is φ = 7630699440.

The previous prime is 8394540743. The next prime is 8394540793. The reversal of 8394540781 is 1870454938.

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

It is a cyclic number.

It is not a de Polignac number, because 8394540781 - 2⁹ = 8394540269 is a prime.

It is a super-2 number, since 2×8394540781² (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 (8394540701) 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, 119830 + ... + 176488.

It is an arithmetic number, because the mean of its divisors is an integer number (1144815300).

Almost surely, 2^8394540781 is an apocalyptic number.

It is an amenable number.

8394540781 is a deficient number, since it is larger than the sum of its proper divisors (763981619).

8394540781 is a wasteful number, since it uses less digits than its factorization.

8394540781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70139.

The product of its (nonzero) digits is 967680, while the sum is 49.

The square root of 8394540781 is about 91621.7265772699. The cubic root of 8394540781 is about 2032.3522427734.

The spelling of 8394540781 in words is "eight billion, three hundred ninety-four million, five hundred forty thousand, seven hundred eighty-one".