240987809 has 2 divisors, whose sum is σ = 240987810. Its totient is φ = 240987808.

The previous prime is 240987793. The next prime is 240987821. The reversal of 240987809 is 908789042.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 173501584 + 67486225 = 13172^2 + 8215^2 .

It is a cyclic number.

It is not a de Polignac number, because 240987809 - 2⁴ = 240987793 is a prime.

It is not a weakly prime, because it can be changed into another prime (240987899) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120493904 + 120493905.

It is an arithmetic number, because the mean of its divisors is an integer number (120493905).

Almost surely, 2^240987809 is an apocalyptic number.

It is an amenable number.

240987809 is a deficient number, since it is larger than the sum of its proper divisors (1).

240987809 is an equidigital number, since it uses as much as digits as its factorization.

240987809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 290304, while the sum is 47.

The square root of 240987809 is about 15523.7820456228. The cubic root of 240987809 is about 622.2979319735.

The spelling of 240987809 in words is "two hundred forty million, nine hundred eighty-seven thousand, eight hundred nine".