243255521400 has 96 divisors (see below), whose sum is σ = 754167027840. Its totient is φ = 64861695360.

The previous prime is 243255521371. The next prime is 243255521449. The reversal of 243255521400 is 4125552342.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11909997 + ... + 11930403.

It is an arithmetic number, because the mean of its divisors is an integer number (7855906540).

Almost surely, 2^243255521400 is an apocalyptic number.

243255521400 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243255521400 is an abundant number, since it is smaller than the sum of its proper divisors (510911506440).

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

243255521400 is a wasteful number, since it uses less digits than its factorization.

243255521400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40293 (or 40284 counting only the distinct ones).

The product of its (nonzero) digits is 48000, while the sum is 33.

The spelling of 243255521400 in words is "two hundred forty-three billion, two hundred fifty-five million, five hundred twenty-one thousand, four hundred".