213869 has 4 divisors (see below), whose sum is σ = 220800. Its totient is φ = 206940.

The previous prime is 213859. The next prime is 213881. The reversal of 213869 is 968312.

213869 = 266² + 267² + 268².

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 213869 - 2⁸ = 213613 is a prime.

It is a super-2 number, since 2×213869² = 91479898322, which contains 22 as substring.

It is a Duffinian 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 213869.

It is not an unprimeable number, because it can be changed into a prime (213859) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3419 + ... + 3480.

It is an arithmetic number, because the mean of its divisors is an integer number (55200).

2²¹³⁸⁶⁹ is an apocalyptic number.

It is an amenable number.

213869 is a deficient number, since it is larger than the sum of its proper divisors (6931).

213869 is an equidigital number, since it uses as much as digits as its factorization.

213869 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6930.

The product of its digits is 2592, while the sum is 29.

The square root of 213869 is about 462.4597279764. The cubic root of 213869 is about 59.8020327195.

The spelling of 213869 in words is "two hundred thirteen thousand, eight hundred sixty-nine".