3240405 has 56 divisors (see below), whose sum is σ = 6715392. Its totient is φ = 1469664.

The previous prime is 3240389. The next prime is 3240407. The reversal of 3240405 is 5040423.

It is a happy number.

It is not a de Polignac number, because 3240405 - 2⁴ = 3240389 is a prime.

It is a Curzon number.

3240405 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3240407) by changing a digit.

It is a polite number, since it can be written in 55 ways as a sum of consecutive naturals, for example, 25452 + ... + 25578.

Almost surely, 2^3240405 is an apocalyptic number.

3240405 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

3240405 is an abundant number, since it is smaller than the sum of its proper divisors (3474987).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

3240405 is an equidigital number, since it uses as much as digits as its factorization.

3240405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157 (or 142 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 18.

The square root of 3240405 is about 1800.1124964846. The cubic root of 3240405 is about 147.9788897331.

Adding to 3240405 its sum of digits (18), we get a palindrome (3240423).

Adding to 3240405 its reverse (5040423), we get a palindrome (8280828).

The spelling of 3240405 in words is "three million, two hundred forty thousand, four hundred five".