8130729 has 8 divisors (see below), whose sum is σ = 10906560. Its totient is φ = 5387696.

The previous prime is 8130721. The next prime is 8130737. The reversal of 8130729 is 9270318.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (8130721) and next prime (8130737).

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 8130729 - 2³ = 8130721 is a prime.

It is a super-2 number, since 2×8130729² = 132217508142882, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 8130696 and 8130705.

It is not an unprimeable number, because it can be changed into a prime (8130721) 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, 7614 + ... + 8615.

It is an arithmetic number, because the mean of its divisors is an integer number (1363320).

Almost surely, 2^8130729 is an apocalyptic number.

It is an amenable number.

8130729 is a deficient number, since it is larger than the sum of its proper divisors (2775831).

8130729 is a wasteful number, since it uses less digits than its factorization.

8130729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16399.

The product of its (nonzero) digits is 3024, while the sum is 30.

The square root of 8130729 is about 2851.4433187423. The cubic root of 8130729 is about 201.0835275725.

The spelling of 8130729 in words is "eight million, one hundred thirty thousand, seven hundred twenty-nine".