240140009 has 2 divisors, whose sum is σ = 240140010. Its totient is φ = 240140008.

The previous prime is 240139973. The next prime is 240140051. The reversal of 240140009 is 900041042.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 159643225 + 80496784 = 12635^2 + 8972^2 .

It is a cyclic number.

It is not a de Polignac number, because 240140009 - 2¹² = 240135913 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (240140059) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120070004 + 120070005.

It is an arithmetic number, because the mean of its divisors is an integer number (120070005).

Almost surely, 2^240140009 is an apocalyptic number.

It is an amenable number.

240140009 is a deficient number, since it is larger than the sum of its proper divisors (1).

240140009 is an equidigital number, since it uses as much as digits as its factorization.

240140009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 240140009 is about 15496.4514970363. The cubic root of 240140009 is about 621.5673222871.

The spelling of 240140009 in words is "two hundred forty million, one hundred forty thousand, nine".