213986 has 4 divisors (see below), whose sum is σ = 320982. Its totient is φ = 106992.

The previous prime is 213977. The next prime is 213989. The reversal of 213986 is 689312.

213986 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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., 112225 + 101761 = 335^2 + 319^2 .

It is not an unprimeable number, because it can be changed into a prime (213989) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 53495 + ... + 53498.

2²¹³⁹⁸⁶ is an apocalyptic number.

213986 is a deficient number, since it is larger than the sum of its proper divisors (106996).

213986 is a wasteful number, since it uses less digits than its factorization.

213986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106995.

The product of its digits is 2592, while the sum is 29.

The square root of 213986 is about 462.5862081818. The cubic root of 213986 is about 59.8129359084.

It can be divided in two parts, 2 and 13986, that multiplied together give a palindrome (27972).

The spelling of 213986 in words is "two hundred thirteen thousand, nine hundred eighty-six".