240504309 has 10 divisors (see below), whose sum is σ = 359271990. Its totient is φ = 160336152.

The previous prime is 240504283. The next prime is 240504317. The reversal of 240504309 is 903405042.

It can be written as a sum of positive squares in only one way, i.e., 216001809 + 24502500 = 14697^2 + 4950^2 .

It is not a de Polignac number, because 240504309 - 2⁸ = 240504053 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (240504349) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1484514 + ... + 1484675.

It is an arithmetic number, because the mean of its divisors is an integer number (35927199).

Almost surely, 2^240504309 is an apocalyptic number.

It is an amenable number.

240504309 is a deficient number, since it is larger than the sum of its proper divisors (118767681).

240504309 is an equidigital number, since it uses as much as digits as its factorization.

240504309 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2969201 (or 2969192 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 240504309 is about 15508.2013463844. The cubic root of 240504309 is about 621.8814759189.

The spelling of 240504309 in words is "two hundred forty million, five hundred four thousand, three hundred nine".