213918 has 16 divisors (see below), whose sum is σ = 433296. Its totient is φ = 70400.

The previous prime is 213901. The next prime is 213919. The reversal of 213918 is 819312.

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 213918.

It is not an unprimeable number, because it can be changed into a prime (213919) by changing a digit.

213918 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, 430 + ... + 782.

It is an arithmetic number, because the mean of its divisors is an integer number (27081).

2²¹³⁹¹⁸ is an apocalyptic number.

213918 is an abundant number, since it is smaller than the sum of its proper divisors (219378).

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

213918 is a wasteful number, since it uses less digits than its factorization.

213918 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459.

The product of its digits is 432, while the sum is 24.

The square root of 213918 is about 462.5127025283. The cubic root of 213918 is about 59.8065994961.

The spelling of 213918 in words is "two hundred thirteen thousand, nine hundred eighteen".