8145729 has 12 divisors (see below), whose sum is σ = 11988756. Its totient is φ = 5327712.

The previous prime is 8145727. The next prime is 8145733. The reversal of 8145729 is 9275418.

8145729 is a `hidden beast` number, since 81 + 4 + 572 + 9 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 4730625 + 3415104 = 2175^2 + 1848^2 .

It is not a de Polignac number, because 8145729 - 2¹ = 8145727 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 8145693 and 8145702.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (8145727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8062 + ... + 9015.

It is an arithmetic number, because the mean of its divisors is an integer number (999063).

Almost surely, 2^8145729 is an apocalyptic number.

It is an amenable number.

8145729 is a deficient number, since it is larger than the sum of its proper divisors (3843027).

8145729 is a wasteful number, since it uses less digits than its factorization.

8145729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17136 (or 17133 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 8145729 is about 2854.0723536729. The cubic root of 8145729 is about 201.2071081258.

The spelling of 8145729 in words is "eight million, one hundred forty-five thousand, seven hundred twenty-nine".