213857 has 8 divisors (see below), whose sum is σ = 247296. Its totient is φ = 181152.

The previous prime is 213847. The next prime is 213859. The reversal of 213857 is 758312.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-213857 is a prime.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 213857.

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 7 ways as a sum of consecutive naturals, for example, 848 + ... + 1070.

It is an arithmetic number, because the mean of its divisors is an integer number (30912).

2²¹³⁸⁵⁷ is an apocalyptic number.

It is an amenable number.

213857 is a deficient number, since it is larger than the sum of its proper divisors (33439).

213857 is a wasteful number, since it uses less digits than its factorization.

213857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 367.

The product of its digits is 1680, while the sum is 26.

The square root of 213857 is about 462.4467536917. The cubic root of 213857 is about 59.8009142189.

The spelling of 213857 in words is "two hundred thirteen thousand, eight hundred fifty-seven".