86986729 has 4 divisors (see below), whose sum is σ = 87428484. Its totient is φ = 86544976.

The previous prime is 86986723. The next prime is 86986763. The reversal of 86986729 is 92768968.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 75290329 + 11696400 = 8677^2 + 3420^2 .

It is a cyclic number.

It is not a de Polignac number, because 86986729 - 2²¹ = 84889577 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 86986729.

It is not an unprimeable number, because it can be changed into a prime (86986723) 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 3 ways as a sum of consecutive naturals, for example, 220582 + ... + 220975.

It is an arithmetic number, because the mean of its divisors is an integer number (21857121).

Almost surely, 2^86986729 is an apocalyptic number.

It is an amenable number.

86986729 is a deficient number, since it is larger than the sum of its proper divisors (441755).

86986729 is a wasteful number, since it uses less digits than its factorization.

86986729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 441754.

The product of its digits is 2612736, while the sum is 55.

The square root of 86986729 is about 9326.6676256850. The cubic root of 86986729 is about 443.0822305896.

The spelling of 86986729 in words is "eighty-six million, nine hundred eighty-six thousand, seven hundred twenty-nine".