243091540 has 24 divisors (see below), whose sum is σ = 514170720. Its totient is φ = 96535968.

The previous prime is 243091493. The next prime is 243091559. The reversal of 243091540 is 45190342.

243091540 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 243091499 and 243091508.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40942 + ... + 46501.

It is an arithmetic number, because the mean of its divisors is an integer number (21423780).

Almost surely, 2^243091540 is an apocalyptic number.

243091540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

243091540 is an abundant number, since it is smaller than the sum of its proper divisors (271079180).

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

243091540 is a wasteful number, since it uses less digits than its factorization.

243091540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87591 (or 87589 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 243091540 is about 15591.3931385236. The cubic root of 243091540 is about 624.1034954622.

The spelling of 243091540 in words is "two hundred forty-three million, ninety-one thousand, five hundred forty".