240275309 has 2 divisors, whose sum is σ = 240275310. Its totient is φ = 240275308.

The previous prime is 240275291. The next prime is 240275323. The reversal of 240275309 is 903572042.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 210540100 + 29735209 = 14510^2 + 5453^2 .

It is a cyclic number.

It is not a de Polignac number, because 240275309 - 2⁸ = 240275053 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (240275359) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 120137654 + 120137655.

It is an arithmetic number, because the mean of its divisors is an integer number (120137655).

Almost surely, 2^240275309 is an apocalyptic number.

It is an amenable number.

240275309 is a deficient number, since it is larger than the sum of its proper divisors (1).

240275309 is an equidigital number, since it uses as much as digits as its factorization.

240275309 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 15120, while the sum is 32.

The square root of 240275309 is about 15500.8163978547. The cubic root of 240275309 is about 621.6840351300.

The spelling of 240275309 in words is "two hundred forty million, two hundred seventy-five thousand, three hundred nine".