240552781 has 12 divisors (see below), whose sum is σ = 281800096. Its totient is φ = 201149280.

The previous prime is 240552773. The next prime is 240552803. The reversal of 240552781 is 187255042.

It is a happy number.

It is not a de Polignac number, because 240552781 - 2³ = 240552773 is a prime.

It is a super-2 number, since 2×240552781² = 115731280893667922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (240552701) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1546 + ... + 21988.

Almost surely, 2^240552781 is an apocalyptic number.

It is an amenable number.

240552781 is a deficient number, since it is larger than the sum of its proper divisors (41247315).

240552781 is an equidigital number, since it uses as much as digits as its factorization.

240552781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20532 (or 20491 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 34.

The square root of 240552781 is about 15509.7640536534. The cubic root of 240552781 is about 621.9232517664.

The spelling of 240552781 in words is "two hundred forty million, five hundred fifty-two thousand, seven hundred eighty-one".