8142781 has 8 divisors (see below), whose sum is σ = 8370560. Its totient is φ = 7916832.

The previous prime is 8142769. The next prime is 8142787. The reversal of 8142781 is 1872418.

8142781 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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 8142781 - 2⁵ = 8142749 is a prime.

It is a super-2 number, since 2×8142781² = 132609764827922, which 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 (8142787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17356 + ... + 17818.

It is an arithmetic number, because the mean of its divisors is an integer number (1046320).

Almost surely, 2^8142781 is an apocalyptic number.

It is an amenable number.

8142781 is a deficient number, since it is larger than the sum of its proper divisors (227779).

8142781 is a wasteful number, since it uses less digits than its factorization.

8142781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 915.

The product of its digits is 3584, while the sum is 31.

The square root of 8142781 is about 2853.5558519153. Note that the first 3 decimals coincide. The cubic root of 8142781 is about 201.1828324133.

The spelling of 8142781 in words is "eight million, one hundred forty-two thousand, seven hundred eighty-one".