213447 has 12 divisors (see below), whose sum is σ = 308904. Its totient is φ = 131040.

The previous prime is 213407. The next prime is 213449. The reversal of 213447 is 744312.

213447 is digitally balanced in base 2 and base 7, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 213447 - 2⁶ = 213383 is a prime.

It is a d-powerful number, because it can be written as 2¹⁷ + 1 + 4 + 3³ + 4⁸ + 7⁵ .

213447 is strictly pandigital in base 7.

It is a nialpdrome in base 13.

It is a congruent number.

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

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 297 + ... + 717.

It is an arithmetic number, because the mean of its divisors is an integer number (25742).

2²¹³⁴⁴⁷ is an apocalyptic number.

213447 is a deficient number, since it is larger than the sum of its proper divisors (95457).

213447 is a wasteful number, since it uses less digits than its factorization.

213447 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450 (or 437 counting only the distinct ones).

The product of its digits is 672, while the sum is 21.

The square root of 213447 is about 462.0032467418. The cubic root of 213447 is about 59.7626736186.

Adding to 213447 its reverse (744312), we get a palindrome (957759).

The spelling of 213447 in words is "two hundred thirteen thousand, four hundred forty-seven".