240787409 has 2 divisors, whose sum is σ = 240787410. Its totient is φ = 240787408.

The previous prime is 240787381. The next prime is 240787423. The reversal of 240787409 is 904787042.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 215062225 + 25725184 = 14665^2 + 5072^2 .

It is a cyclic number.

It is not a de Polignac number, because 240787409 - 2⁸ = 240787153 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (240787429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120393704 + 120393705.

It is an arithmetic number, because the mean of its divisors is an integer number (120393705).

Almost surely, 2^240787409 is an apocalyptic number.

It is an amenable number.

240787409 is a deficient number, since it is larger than the sum of its proper divisors (1).

240787409 is an equidigital number, since it uses as much as digits as its factorization.

240787409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 112896, while the sum is 41.

The square root of 240787409 is about 15517.3260905351. The cubic root of 240787409 is about 622.1253878515.

The spelling of 240787409 in words is "two hundred forty million, seven hundred eighty-seven thousand, four hundred nine".