729398505 has 32 divisors (see below), whose sum is σ = 1340144640. Its totient is φ = 335033280.

The previous prime is 729398497. The next prime is 729398507. The reversal of 729398505 is 505893927.

It is a happy number.

It is not a de Polignac number, because 729398505 - 2³ = 729398497 is a prime.

It is a super-5 number, since 5×729398505⁵ (a number of 46 digits) contains 55555 as substring.

It is not an unprimeable number, because it can be changed into a prime (729398507) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 113197 + ... + 119466.

It is an arithmetic number, because the mean of its divisors is an integer number (41879520).

Almost surely, 2^729398505 is an apocalyptic number.

It is an amenable number.

729398505 is a deficient number, since it is larger than the sum of its proper divisors (610746135).

729398505 is a wasteful number, since it uses less digits than its factorization.

729398505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232701.

The product of its (nonzero) digits is 680400, while the sum is 48.

The square root of 729398505 is about 27007.3787139737. The cubic root of 729398505 is about 900.1639639540.

The spelling of 729398505 in words is "seven hundred twenty-nine million, three hundred ninety-eight thousand, five hundred five".