12340405 has 48 divisors (see below), whose sum is σ = 19863360. Its totient is φ = 7257600.

The previous prime is 12340403. The next prime is 12340409. The reversal of 12340405 is 50404321.

It is not a de Polignac number, because 12340405 - 2¹ = 12340403 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12340403) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 51085 + ... + 51325.

It is an arithmetic number, because the mean of its divisors is an integer number (413820).

Almost surely, 2^12340405 is an apocalyptic number.

It is an amenable number.

12340405 is a deficient number, since it is larger than the sum of its proper divisors (7522955).

12340405 is a wasteful number, since it uses less digits than its factorization.

12340405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290 (or 283 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 12340405 is about 3512.8912593475. The cubic root of 12340405 is about 231.0875089326.

Adding to 12340405 its reverse (50404321), we get a palindrome (62744726).

The spelling of 12340405 in words is "twelve million, three hundred forty thousand, four hundred five".