243929440 has 48 divisors (see below), whose sum is σ = 596166480. Its totient is φ = 94205440.

The previous prime is 243929437. The next prime is 243929449. The reversal of 243929440 is 44929342.

It is a self number, because there is not a number n which added to its sum of digits gives 243929440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (243929449) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21646 + ... + 30925.

It is an arithmetic number, because the mean of its divisors is an integer number (12420135).

Almost surely, 2^243929440 is an apocalyptic number.

243929440 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243929440 is an abundant number, since it is smaller than the sum of its proper divisors (352237040).

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

243929440 is a wasteful number, since it uses less digits than its factorization.

243929440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 52615 (or 52607 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 37.

The square root of 243929440 is about 15618.2406179441. The cubic root of 243929440 is about 624.8197368133.

The spelling of 243929440 in words is "two hundred forty-three million, nine hundred twenty-nine thousand, four hundred forty".