8349781 has 8 divisors (see below), whose sum is σ = 9145728. Its totient is φ = 7560000.

The previous prime is 8349743. The next prime is 8349787. The reversal of 8349781 is 1879438.

8349781 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 8349781 - 2⁹ = 8349269 is a prime.

It is a super-2 number, since 2×8349781² = 139437685495922, which contains 22 as substring.

It is a Duffinian number.

8349781 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8349787) 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, 1581 + ... + 4381.

It is an arithmetic number, because the mean of its divisors is an integer number (1143216).

Almost surely, 2^8349781 is an apocalyptic number.

It is an amenable number.

8349781 is a deficient number, since it is larger than the sum of its proper divisors (795947).

8349781 is a wasteful number, since it uses less digits than its factorization.

8349781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3083.

The product of its digits is 48384, while the sum is 40.

The square root of 8349781 is about 2889.5987610739. The cubic root of 8349781 is about 202.8733629023.

Subtracting from 8349781 its sum of digits (40), we obtain a triangular number (8349741 = T₄₀₈₆).

The spelling of 8349781 in words is "eight million, three hundred forty-nine thousand, seven hundred eighty-one".