216742 has 8 divisors (see below), whose sum is σ = 327096. Its totient is φ = 107712.

The previous prime is 216731. The next prime is 216743. The reversal of 216742 is 247612.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (216743) 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, 438 + ... + 790.

It is an arithmetic number, because the mean of its divisors is an integer number (40887).

2²¹⁶⁷⁴² is an apocalyptic number.

216742 is a deficient number, since it is larger than the sum of its proper divisors (110354).

216742 is a wasteful number, since it uses less digits than its factorization.

216742 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 662.

The product of its digits is 672, while the sum is 22.

The square root of 216742 is about 465.5555820737. Note that the first 4 decimals coincide. The cubic root of 216742 is about 60.0686251835.

It can be divided in two parts, 2167 and 42, that added together give a square (2209 = 47²).

The spelling of 216742 in words is "two hundred sixteen thousand, seven hundred forty-two".