210540729 has 16 divisors (see below), whose sum is σ = 337710080. Its totient is φ = 113976720.

The previous prime is 210540721. The next prime is 210540739. The reversal of 210540729 is 927045012.

It is not a de Polignac number, because 210540729 - 2³ = 210540721 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 210540696 and 210540705.

It is not an unprimeable number, because it can be changed into a prime (210540721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 263437 + ... + 264234.

It is an arithmetic number, because the mean of its divisors is an integer number (21106880).

Almost surely, 2^210540729 is an apocalyptic number.

It is an amenable number.

210540729 is a deficient number, since it is larger than the sum of its proper divisors (127169351).

210540729 is a wasteful number, since it uses less digits than its factorization.

210540729 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 527700.

The product of its (nonzero) digits is 5040, while the sum is 30.

The square root of 210540729 is about 14510.0216746909. The cubic root of 210540729 is about 594.9019248466.

The spelling of 210540729 in words is "two hundred ten million, five hundred forty thousand, seven hundred twenty-nine".