240991540 has 24 divisors (see below), whose sum is σ = 508489632. Its totient is φ = 95938080.

The previous prime is 240991523. The next prime is 240991549. The reversal of 240991540 is 45199042.

It is a junction number, because it is equal to n+sod(n) for n = 240991496 and 240991505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (240991549) 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, 24334 + ... + 32773.

It is an arithmetic number, because the mean of its divisors is an integer number (21187068).

Almost surely, 2^240991540 is an apocalyptic number.

240991540 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

240991540 is an abundant number, since it is smaller than the sum of its proper divisors (267498092).

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

240991540 is a wasteful number, since it uses less digits than its factorization.

240991540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57327 (or 57325 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 34.

The square root of 240991540 is about 15523.9022156158. The cubic root of 240991540 is about 622.3011434522.

The spelling of 240991540 in words is "two hundred forty million, nine hundred ninety-one thousand, five hundred forty".