240540239 has 4 divisors (see below), whose sum is σ = 248834760. Its totient is φ = 232245720.

The previous prime is 240540229. The next prime is 240540257. The reversal of 240540239 is 932045042.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 932045042 = 2 ⋅466022521.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-240540239 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (29), and also a Moran number because the ratio is a prime number: 8294491 = 240540239 / (2 + 4 + 0 + 5 + 4 + 0 + 2 + 3 + 9).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (240540229) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4147217 + ... + 4147274.

It is an arithmetic number, because the mean of its divisors is an integer number (62208690).

Almost surely, 2^240540239 is an apocalyptic number.

240540239 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

240540239 is a deficient number, since it is larger than the sum of its proper divisors (8294521).

240540239 is an equidigital number, since it uses as much as digits as its factorization.

240540239 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8294520.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 240540239 is about 15509.3597224386. The cubic root of 240540239 is about 621.9124429161.

The spelling of 240540239 in words is "two hundred forty million, five hundred forty thousand, two hundred thirty-nine".