243320040 has 48 divisors (see below), whose sum is σ = 790791300. Its totient is φ = 64885248.

The previous prime is 243320027. The next prime is 243320113. The reversal of 243320040 is 40023342.

It can be written as a sum of positive squares in 2 ways, for example, as 234641124 + 8678916 = 15318^2 + 2946^2 .

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 243319995 and 243320022.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 337585 + ... + 338304.

Almost surely, 2^243320040 is an apocalyptic number.

243320040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243320040 is an abundant number, since it is smaller than the sum of its proper divisors (547471260).

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

243320040 is a wasteful number, since it uses less digits than its factorization.

243320040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 675906 (or 675899 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 18.

The square root of 243320040 is about 15598.7191781890. The cubic root of 243320040 is about 624.2989814775.

Adding to 243320040 its reverse (40023342), we get a palindrome (283343382).

The spelling of 243320040 in words is "two hundred forty-three million, three hundred twenty thousand, forty".