240000521 has 4 divisors (see below), whose sum is σ = 240035844. Its totient is φ = 239965200.

The previous prime is 240000503. The next prime is 240000539. The reversal of 240000521 is 125000042.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (240000503) and next prime (240000539).

It can be written as a sum of positive squares in 2 ways, for example, as 161925625 + 78074896 = 12725^2 + 8836^2 .

It is a cyclic number.

It is not a de Polignac number, because 240000521 - 2²⁶ = 172891657 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 240000496 and 240000505.

It is not an unprimeable number, because it can be changed into a prime (240000721) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3890 + ... + 22251.

It is an arithmetic number, because the mean of its divisors is an integer number (60008961).

Almost surely, 2^240000521 is an apocalyptic number.

It is an amenable number.

240000521 is a deficient number, since it is larger than the sum of its proper divisors (35323).

240000521 is an equidigital number, since it uses as much as digits as its factorization.

240000521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35322.

The product of its (nonzero) digits is 80, while the sum is 14.

The square root of 240000521 is about 15491.9502000232. The cubic root of 240000521 is about 621.4469508760.

Adding to 240000521 its reverse (125000042), we get a palindrome (365000563).

The spelling of 240000521 in words is "two hundred forty million, five hundred twenty-one", and thus it is an aban number.