215730 has 64 divisors (see below), whose sum is σ = 622080. Its totient is φ = 52992.

The previous prime is 215723. The next prime is 215737. The reversal of 215730 is 37512.

215730 = 2² + 3² + ... + 86².

215730 is digitally balanced in base 2 and base 3, because in such bases it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (215723) and next prime (215737).

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (215737) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4567 + ... + 4613.

It is an arithmetic number, because the mean of its divisors is an integer number (9720).

2²¹⁵⁷³⁰ is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 215730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (311040).

215730 is an abundant number, since it is smaller than the sum of its proper divisors (406350).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

215730 is a wasteful number, since it uses less digits than its factorization.

215730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80 (or 74 counting only the distinct ones).

The product of its (nonzero) digits is 210, while the sum is 18.

The square root of 215730 is about 464.4674369641. The cubic root of 215730 is about 59.9749895761.

It can be divided in two parts, 2157 and 30, that added together give a 7-th power (2187 = 3⁷).

The spelling of 215730 in words is "two hundred fifteen thousand, seven hundred thirty".