240538691 has 2 divisors, whose sum is σ = 240538692. Its totient is φ = 240538690.

The previous prime is 240538657. The next prime is 240538733. The reversal of 240538691 is 196835042.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-240538691 is a prime.

It is not a weakly prime, because it can be changed into another prime (240538091) 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, 120269345 + 120269346.

It is an arithmetic number, because the mean of its divisors is an integer number (120269346).

Almost surely, 2^240538691 is an apocalyptic number.

240538691 is a deficient number, since it is larger than the sum of its proper divisors (1).

240538691 is an equidigital number, since it uses as much as digits as its factorization.

240538691 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 240538691 is about 15509.3098170099. The cubic root of 240538691 is about 621.9111088046.

The spelling of 240538691 in words is "two hundred forty million, five hundred thirty-eight thousand, six hundred ninety-one".