213706 has 4 divisors (see below), whose sum is σ = 320562. Its totient is φ = 106852.

The previous prime is 213659. The next prime is 213713. The reversal of 213706 is 607312.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 210681 + 3025 = 459^2 + 55^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53425 + ... + 53428.

2²¹³⁷⁰⁶ is an apocalyptic number.

213706 is a deficient number, since it is larger than the sum of its proper divisors (106856).

213706 is a wasteful number, since it uses less digits than its factorization.

213706 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 106855.

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 213706 is about 462.2834628234. The cubic root of 213706 is about 59.7868361758.

It can be divided in two parts, 213 and 706, that added together give a palindrome (919).

The spelling of 213706 in words is "two hundred thirteen thousand, seven hundred six".