240405505 has 16 divisors (see below), whose sum is σ = 298915920. Its totient is φ = 185393152.

The previous prime is 240405491. The next prime is 240405511. The reversal of 240405505 is 505504042.

It can be written as a sum of positive squares in 8 ways, for example, as 55472704 + 184932801 = 7448^2 + 13599^2 .

It is a cyclic number.

It is not a de Polignac number, because 240405505 - 2⁷ = 240405377 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 240405505.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 140817 + ... + 142513.

It is an arithmetic number, because the mean of its divisors is an integer number (18682245).

Almost surely, 2^240405505 is an apocalyptic number.

It is an amenable number.

240405505 is a deficient number, since it is larger than the sum of its proper divisors (58510415).

240405505 is a wasteful number, since it uses less digits than its factorization.

240405505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2708.

The product of its (nonzero) digits is 4000, while the sum is 25.

The square root of 240405505 is about 15505.0154788701. The cubic root of 240405505 is about 621.7963037880.

Adding to 240405505 its reverse (505504042), we get a palindrome (745909547).

The spelling of 240405505 in words is "two hundred forty million, four hundred five thousand, five hundred five".