240405 has 32 divisors (see below), whose sum is σ = 442368. Its totient is φ = 110400.

The previous prime is 240379. The next prime is 240421. The reversal of 240405 is 504042.

It is not a de Polignac number, because 240405 - 2⁶ = 240341 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (15).

240405 is a modest number, since divided by 405 gives 240 as remainder.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5092 + ... + 5138.

It is an arithmetic number, because the mean of its divisors is an integer number (13824).

2²⁴⁰⁴⁰⁵ is an apocalyptic number.

It is an amenable number.

240405 is a deficient number, since it is larger than the sum of its proper divisors (201963).

240405 is a wasteful number, since it uses less digits than its factorization.

240405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97.

The product of its (nonzero) digits is 160, while the sum is 15.

The square root of 240405 is about 490.3111257151. The cubic root of 240405 is about 62.1795868402.

Adding to 240405 its reverse (504042), we get a palindrome (744447).

The spelling of 240405 in words is "two hundred forty thousand, four hundred five".