216402 has 8 divisors (see below), whose sum is σ = 432816. Its totient is φ = 72132.

The previous prime is 216401. The next prime is 216421. The reversal of 216402 is 204612.

216402 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

216402 is an admirable number.

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (216401) 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, 18028 + ... + 18039.

It is an arithmetic number, because the mean of its divisors is an integer number (54102).

2²¹⁶⁴⁰² is an apocalyptic number.

216402 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

216402 is a wasteful number, since it uses less digits than its factorization.

216402 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36072.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 216402 is about 465.1902836475. The cubic root of 216402 is about 60.0371991545.

The spelling of 216402 in words is "two hundred sixteen thousand, four hundred two".