213438 has 8 divisors (see below), whose sum is σ = 426888. Its totient is φ = 71144.

The previous prime is 213407. The next prime is 213449. The reversal of 213438 is 834312.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

213438 is an admirable number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 213438.

It is an unprimeable number.

213438 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 3 ways as a sum of consecutive naturals, for example, 17781 + ... + 17792.

It is an arithmetic number, because the mean of its divisors is an integer number (53361).

2²¹³⁴³⁸ is an apocalyptic number.

213438 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

213438 is a wasteful number, since it uses less digits than its factorization.

213438 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35578.

The product of its digits is 576, while the sum is 21.

The square root of 213438 is about 461.9935064479. The cubic root of 213438 is about 59.7618336418.

The spelling of 213438 in words is "two hundred thirteen thousand, four hundred thirty-eight".