213723 has 6 divisors (see below), whose sum is σ = 308724. Its totient is φ = 142476.

The previous prime is 213721. The next prime is 213727. The reversal of 213723 is 327312.

It is not a de Polignac number, because 213723 - 2¹ = 213721 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 213696 and 213705.

It is not an unprimeable number, because it can be changed into a prime (213721) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11865 + ... + 11882.

It is an arithmetic number, because the mean of its divisors is an integer number (51454).

2²¹³⁷²³ is an apocalyptic number.

213723 is a deficient number, since it is larger than the sum of its proper divisors (95001).

213723 is a wasteful number, since it uses less digits than its factorization.

213723 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23753 (or 23750 counting only the distinct ones).

The product of its digits is 252, while the sum is 18.

The square root of 213723 is about 462.3018494447. The cubic root of 213723 is about 59.7884214523.

The spelling of 213723 in words is "two hundred thirteen thousand, seven hundred twenty-three".