4240405 has 16 divisors (see below), whose sum is σ = 5549040. Its totient is φ = 3091968.

The previous prime is 4240399. The next prime is 4240417. The reversal of 4240405 is 5040424.

It can be written as a sum of positive squares in 8 ways, for example, as 54289 + 4186116 = 233^2 + 2046^2 .

It is a cyclic number.

It is not a de Polignac number, because 4240405 - 2⁷ = 4240277 is a prime.

It is a congruent number.

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, 5419 + ... + 6151.

It is an arithmetic number, because the mean of its divisors is an integer number (346815).

Almost surely, 2^4240405 is an apocalyptic number.

It is an amenable number.

4240405 is a deficient number, since it is larger than the sum of its proper divisors (1308635).

4240405 is a wasteful number, since it uses less digits than its factorization.

4240405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 840.

The product of its (nonzero) digits is 640, while the sum is 19.

The square root of 4240405 is about 2059.2243685427. The cubic root of 4240405 is about 161.8585998799.

Adding to 4240405 its sum of digits (19), we get a palindrome (4240424).

Adding to 4240405 its reverse (5040424), we get a palindrome (9280829).

The spelling of 4240405 in words is "four million, two hundred forty thousand, four hundred five".