240420517 has 2 divisors, whose sum is σ = 240420518. Its totient is φ = 240420516.

The previous prime is 240420503. The next prime is 240420533. The reversal of 240420517 is 715024042.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 179720836 + 60699681 = 13406^2 + 7791^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-240420517 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 240420491 and 240420500.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (240420577) 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 as a sum of consecutive naturals, namely, 120210258 + 120210259.

It is an arithmetic number, because the mean of its divisors is an integer number (120210259).

Almost surely, 2^240420517 is an apocalyptic number.

It is an amenable number.

240420517 is a deficient number, since it is larger than the sum of its proper divisors (1).

240420517 is an equidigital number, since it uses as much as digits as its factorization.

240420517 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2240, while the sum is 25.

The square root of 240420517 is about 15505.4995727323. The cubic root of 240420517 is about 621.8092461037.

Adding to 240420517 its reverse (715024042), we get a palindrome (955444559).

The spelling of 240420517 in words is "two hundred forty million, four hundred twenty thousand, five hundred seventeen".