213446 has 16 divisors (see below), whose sum is σ = 347760. Its totient is φ = 97920.

The previous prime is 213407. The next prime is 213449. The reversal of 213446 is 644312.

It is a happy number.

It is an Ulam number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (213449) by changing a digit.

213446 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1490 + ... + 1626.

It is an arithmetic number, because the mean of its divisors is an integer number (21735).

2²¹³⁴⁴⁶ is an apocalyptic number.

213446 is a deficient number, since it is larger than the sum of its proper divisors (134314).

213446 is a wasteful number, since it uses less digits than its factorization.

213446 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 199.

The product of its digits is 576, while the sum is 20.

The square root of 213446 is about 462.0021644971. The cubic root of 213446 is about 59.7625802890.

Adding to 213446 its reverse (644312), we get a palindrome (857758).

The spelling of 213446 in words is "two hundred thirteen thousand, four hundred forty-six".