1213043405 has 8 divisors (see below), whose sum is σ = 1663602432. Its totient is φ = 831801168.

The previous prime is 1213043401. The next prime is 1213043413. The reversal of 1213043405 is 5043403121.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1213043405 - 2² = 1213043401 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1213043401) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17329157 + ... + 17329226.

It is an arithmetic number, because the mean of its divisors is an integer number (207950304).

Almost surely, 2^1213043405 is an apocalyptic number.

It is an amenable number.

1213043405 is a deficient number, since it is larger than the sum of its proper divisors (450559027).

1213043405 is an equidigital number, since it uses as much as digits as its factorization.

1213043405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34658395.

The product of its (nonzero) digits is 1440, while the sum is 23.

The square root of 1213043405 is about 34828.7726599718. The cubic root of 1213043405 is about 1066.4948935093.

Adding to 1213043405 its reverse (5043403121), we get a palindrome (6256446526).

The spelling of 1213043405 in words is "one billion, two hundred thirteen million, forty-three thousand, four hundred five".