243689920 has 28 divisors (see below), whose sum is σ = 580287384. Its totient is φ = 97475840.

The previous prime is 243689903. The next prime is 243689933. The reversal of 243689920 is 29986342.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 380446 + ... + 381085.

Almost surely, 2^243689920 is an apocalyptic number.

243689920 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243689920 is an abundant number, since it is smaller than the sum of its proper divisors (336597464).

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

243689920 is an equidigital number, since it uses as much as digits as its factorization.

243689920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 761548 (or 761538 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 43.

The square root of 243689920 is about 15610.5707775212. The cubic root of 243689920 is about 624.6151614875.

The spelling of 243689920 in words is "two hundred forty-three million, six hundred eighty-nine thousand, nine hundred twenty".