8142729 has 8 divisors (see below), whose sum is σ = 12408000. Its totient is φ = 4652976.

The previous prime is 8142727. The next prime is 8142731. The reversal of 8142729 is 9272418.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (8142727) and next prime (8142731).

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

It is not a de Polignac number, because 8142729 - 2¹ = 8142727 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 8142729.

It is not an unprimeable number, because it can be changed into a prime (8142727) 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, 193854 + ... + 193895.

It is an arithmetic number, because the mean of its divisors is an integer number (1551000).

Almost surely, 2^8142729 is an apocalyptic number.

It is an amenable number.

8142729 is a deficient number, since it is larger than the sum of its proper divisors (4265271).

8142729 is a wasteful number, since it uses less digits than its factorization.

8142729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 387759.

The product of its digits is 8064, while the sum is 33.

The square root of 8142729 is about 2853.5467404618. The cubic root of 8142729 is about 201.1824041596.

The spelling of 8142729 in words is "eight million, one hundred forty-two thousand, seven hundred twenty-nine".