243654640 has 40 divisors (see below), whose sum is σ = 591131808. Its totient is φ = 93223680.

The previous prime is 243654623. The next prime is 243654647. The reversal of 243654640 is 46456342.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 243654596 and 243654605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243654647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64371 + ... + 68050.

Almost surely, 2^243654640 is an apocalyptic number.

243654640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243654640 is an abundant number, since it is smaller than the sum of its proper divisors (347477168).

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

243654640 is a wasteful number, since it uses less digits than its factorization.

243654640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 132457 (or 132451 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 34.

The square root of 243654640 is about 15609.4407330948. The cubic root of 243654640 is about 624.5850173240.

The spelling of 243654640 in words is "two hundred forty-three million, six hundred fifty-four thousand, six hundred forty".