243396 has 18 divisors (see below), whose sum is σ = 615342. Its totient is φ = 81120.

The previous prime is 243391. The next prime is 243401. The reversal of 243396 is 693342.

It is an interprime number because it is at equal distance from previous prime (243391) and next prime (243401).

It can be written as a sum of positive squares in only one way, i.e., 230400 + 12996 = 480^2 + 114^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×243396² = 118483225632, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (243391) by changing a digit.

243396 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3345 + ... + 3416.

2²⁴³³⁹⁶ is an apocalyptic number.

It is an amenable number.

243396 is an abundant number, since it is smaller than the sum of its proper divisors (371946).

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

243396 is a wasteful number, since it uses less digits than its factorization.

243396 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6771 (or 6766 counting only the distinct ones).

The product of its digits is 3888, while the sum is 27.

The square root of 243396 is about 493.3518014561. The cubic root of 243396 is about 62.4363939570.

The spelling of 243396 in words is "two hundred forty-three thousand, three hundred ninety-six".