213812 has 6 divisors (see below), whose sum is σ = 374178. Its totient is φ = 106904.

The previous prime is 213799. The next prime is 213821. The reversal of 213812 is 218312.

It can be written as a sum of positive squares in only one way, i.e., 190096 + 23716 = 436^2 + 154^2 .

It is a nialpdrome in base 13.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 26723 + ... + 26730.

It is an arithmetic number, because the mean of its divisors is an integer number (62363).

2²¹³⁸¹² is an apocalyptic number.

It is an amenable number.

213812 is a deficient number, since it is larger than the sum of its proper divisors (160366).

213812 is a wasteful number, since it uses less digits than its factorization.

213812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53457 (or 53455 counting only the distinct ones).

The product of its digits is 96, while the sum is 17.

The square root of 213812 is about 462.3980968819. The cubic root of 213812 is about 59.7967194690.

The spelling of 213812 in words is "two hundred thirteen thousand, eight hundred twelve".