243021040 has 20 divisors (see below), whose sum is σ = 565024104. Its totient is φ = 97208384.

The previous prime is 243021029. The next prime is 243021041. The reversal of 243021040 is 40120342.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243021041) 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, 1518802 + ... + 1518961.

Almost surely, 2^243021040 is an apocalyptic number.

243021040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243021040 is an abundant number, since it is smaller than the sum of its proper divisors (322003064).

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

243021040 is a wasteful number, since it uses less digits than its factorization.

243021040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3037776 (or 3037770 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 16.

The square root of 243021040 is about 15589.1321118271. The cubic root of 243021040 is about 624.0431566689.

Adding to 243021040 its reverse (40120342), we get a palindrome (283141382).

The spelling of 243021040 in words is "two hundred forty-three million, twenty-one thousand, forty".