8190729 has 18 divisors (see below), whose sum is σ = 12491466. Its totient is φ = 5171040.

The previous prime is 8190701. The next prime is 8190751. The reversal of 8190729 is 9270918.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 4210704 + 3980025 = 2052^2 + 1995^2 .

It is not a de Polignac number, because 8190729 - 2⁵ = 8190697 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 = 8190693 and 8190702.

It is not an unprimeable number, because it can be changed into a prime (8190029) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1989 + ... + 4509.

Almost surely, 2^8190729 is an apocalyptic number.

It is an amenable number.

8190729 is a deficient number, since it is larger than the sum of its proper divisors (4300737).

8190729 is a wasteful number, since it uses less digits than its factorization.

8190729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2565 (or 2543 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 36.

The square root of 8190729 is about 2861.9449680244. The cubic root of 8190729 is about 201.5769419254.

The spelling of 8190729 in words is "eight million, one hundred ninety thousand, seven hundred twenty-nine".