213730 has 32 divisors (see below), whose sum is σ = 440640. Its totient is φ = 73920.

The previous prime is 213727. The next prime is 213737. The reversal of 213730 is 37312.

213730 = T₄₄ + T₄₅ + ... + T₁₁₀.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213737) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3157 + ... + 3223.

It is an arithmetic number, because the mean of its divisors is an integer number (13770).

2²¹³⁷³⁰ is an apocalyptic number.

213730 is an abundant number, since it is smaller than the sum of its proper divisors (226910).

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

213730 is a wasteful number, since it uses less digits than its factorization.

213730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114.

The product of its (nonzero) digits is 126, while the sum is 16.

The square root of 213730 is about 462.3094201939. The cubic root of 213730 is about 59.7890741887.

The spelling of 213730 in words is "two hundred thirteen thousand, seven hundred thirty".