210730 has 16 divisors (see below), whose sum is σ = 408744. Its totient is φ = 77760.

The previous prime is 210719. The next prime is 210731. The reversal of 210730 is 37012.

It can be written as a sum of positive squares in 4 ways, for example, as 159201 + 51529 = 399^2 + 227^2 .

It is a Harshad number since it is a multiple of its sum of digits (13).

It is a self number, because there is not a number n which added to its sum of digits gives 210730.

It is not an unprimeable number, because it can be changed into a prime (210731) 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, 681 + ... + 940.

2²¹⁰⁷³⁰ is an apocalyptic number.

210730 is a deficient number, since it is larger than the sum of its proper divisors (198014).

210730 is a wasteful number, since it uses less digits than its factorization.

210730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1641.

The product of its (nonzero) digits is 42, while the sum is 13.

The square root of 210730 is about 459.0533738031. The cubic root of 210730 is about 59.5080138913.

Adding to 210730 its reverse (37012), we get a palindrome (247742).

The spelling of 210730 in words is "two hundred ten thousand, seven hundred thirty".