243392040 has 160 divisors (see below), whose sum is σ = 837571680. Its totient is φ = 63358848.

The previous prime is 243392029. The next prime is 243392053. The reversal of 243392040 is 40293342.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 243391995 and 243392013.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 138447 + ... + 140193.

It is an arithmetic number, because the mean of its divisors is an integer number (5234823).

Almost surely, 2^243392040 is an apocalyptic number.

243392040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 243392040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (418785840).

243392040 is an abundant number, since it is smaller than the sum of its proper divisors (594179640).

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

243392040 is a wasteful number, since it uses less digits than its factorization.

243392040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1813 (or 1800 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 27.

The square root of 243392040 is about 15601.0268892788. The cubic root of 243392040 is about 624.3605534628.

The spelling of 243392040 in words is "two hundred forty-three million, three hundred ninety-two thousand, forty".