240821505 has 40 divisors (see below), whose sum is σ = 433648512. Its totient is φ = 128385648.

The previous prime is 240821501. The next prime is 240821513. The reversal of 240821505 is 505128042.

It is a happy number.

It is not a de Polignac number, because 240821505 - 2² = 240821501 is a prime.

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

It is not an unprimeable number, because it can be changed into a prime (240821501) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 97192 + ... + 99638.

Almost surely, 2^240821505 is an apocalyptic number.

It is an amenable number.

240821505 is a deficient number, since it is larger than the sum of its proper divisors (192827007).

240821505 is an frugal number, since it uses more digits than its factorization.

240821505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2479 (or 2455 counting only the distinct ones).

The product of its (nonzero) digits is 3200, while the sum is 27.

The square root of 240821505 is about 15518.4246945365. The cubic root of 240821505 is about 622.1547512169.

Adding to 240821505 its reverse (505128042), we get a palindrome (745949547).

The spelling of 240821505 in words is "two hundred forty million, eight hundred twenty-one thousand, five hundred five".